diff --git a/progenitor-impl/src/lib.rs b/progenitor-impl/src/lib.rs
index e7e24f5..b3af7f4 100644
--- a/progenitor-impl/src/lib.rs
+++ b/progenitor-impl/src/lib.rs
@@ -179,18 +179,17 @@ impl Generator {
             .flat_map(|(path, ref_or_item)| {
                 // Exclude externally defined path items.
                 let item = ref_or_item.as_item().unwrap();
-                // TODO punt on parameters that apply to all path items for now.
-                assert!(item.parameters.is_empty());
                 item.iter().map(move |(method, operation)| {
-                    (path.as_str(), method, operation)
+                    (path.as_str(), method, operation, &item.parameters)
                 })
             })
-            .map(|(path, method, operation)| {
+            .map(|(path, method, operation, path_parameters)| {
                 self.process_operation(
                     operation,
                     &spec.components,
                     path,
                     method,
+                    path_parameters,
                 )
             })
             .collect::<Result<Vec<_>>>()?;
diff --git a/progenitor-impl/src/method.rs b/progenitor-impl/src/method.rs
index 63e8db1..1f8b8b3 100644
--- a/progenitor-impl/src/method.rs
+++ b/progenitor-impl/src/method.rs
@@ -6,14 +6,14 @@ use std::{
     str::FromStr,
 };
 
-use openapiv3::{Components, Response, StatusCode};
+use openapiv3::{Components, Parameter, ReferenceOr, Response, StatusCode};
 use proc_macro2::TokenStream;
 use quote::{format_ident, quote, ToTokens};
 use typify::TypeId;
 
 use crate::{
     template::PathTemplate,
-    util::{sanitize, Case},
+    util::{items, parameter_map, sanitize, Case},
     Error, Generator, Result, TagStyle,
 };
 use crate::{to_schema::ToSchema, util::ReferenceOrExt};
@@ -237,15 +237,25 @@ impl Generator {
         components: &Option<Components>,
         path: &str,
         method: &str,
+        path_parameters: &[ReferenceOr<Parameter>],
     ) -> Result<OperationMethod> {
         let operation_id = operation.operation_id.as_ref().unwrap();
 
         let mut query: Vec<(String, bool)> = Vec::new();
-        let mut params = operation
-            .parameters
-            .iter()
+
+        let mut combined_path_parameters =
+            parameter_map(&path_parameters, &components)?;
+        for operation_param in items(&operation.parameters, &components) {
+            let parameter = operation_param?;
+            combined_path_parameters
+                .insert(&parameter.parameter_data_ref().name, parameter);
+        }
+
+        // Filter out any path parameters that have been overridden by an operation parameter
+        let mut params = combined_path_parameters
+            .values()
             .map(|parameter| {
-                match parameter.item(components)? {
+                match parameter {
                     openapiv3::Parameter::Path {
                         parameter_data,
                         style: openapiv3::PathStyle::Simple,
@@ -760,6 +770,7 @@ impl Generator {
                 _ => None,
             })
             .collect();
+
         let url_path = method.path.compile(url_renames, client.clone());
 
         // Generate code to handle the body param.
diff --git a/progenitor-impl/src/util.rs b/progenitor-impl/src/util.rs
index 6227c6c..e7c018f 100644
--- a/progenitor-impl/src/util.rs
+++ b/progenitor-impl/src/util.rs
@@ -1,5 +1,7 @@
 // Copyright 2022 Oxide Computer Company
 
+use std::collections::BTreeMap;
+
 use indexmap::IndexMap;
 use openapiv3::{
     Components, Parameter, ReferenceOr, RequestBody, Response, Schema,
@@ -32,6 +34,25 @@ impl<T: ComponentLookup> ReferenceOrExt<T> for openapiv3::ReferenceOr<T> {
     }
 }
 
+pub(crate) fn items<'a, T>(
+    refs: &'a [ReferenceOr<T>],
+    components: &'a Option<Components>,
+) -> impl Iterator<Item = Result<&'a T>>
+where
+    T: ComponentLookup,
+{
+    refs.iter().map(|r| r.item(components))
+}
+
+pub(crate) fn parameter_map<'a>(
+    refs: &'a [ReferenceOr<Parameter>],
+    components: &'a Option<Components>,
+) -> Result<BTreeMap<&'a String, &'a Parameter>> {
+    items(refs, components)
+        .map(|res| res.map(|param| (&param.parameter_data_ref().name, param)))
+        .collect()
+}
+
 impl ComponentLookup for Parameter {
     fn get_components(
         components: &Components,
diff --git a/progenitor-impl/tests/output/param-overrides-builder-tagged.out b/progenitor-impl/tests/output/param-overrides-builder-tagged.out
new file mode 100644
index 0000000..e971fdb
--- /dev/null
+++ b/progenitor-impl/tests/output/param-overrides-builder-tagged.out
@@ -0,0 +1,141 @@
+#[allow(unused_imports)]
+use progenitor_client::{encode_path, RequestBuilderExt};
+pub use progenitor_client::{ByteStream, Error, ResponseValue};
+pub mod types {
+    use serde::{Deserialize, Serialize};
+    #[allow(unused_imports)]
+    use std::convert::TryFrom;
+}
+
+#[derive(Clone, Debug)]
+pub struct Client {
+    pub(crate) baseurl: String,
+    pub(crate) client: reqwest::Client,
+}
+
+impl Client {
+    pub fn new(baseurl: &str) -> Self {
+        let dur = std::time::Duration::from_secs(15);
+        let client = reqwest::ClientBuilder::new()
+            .connect_timeout(dur)
+            .timeout(dur)
+            .build()
+            .unwrap();
+        Self::new_with_client(baseurl, client)
+    }
+
+    pub fn new_with_client(baseurl: &str, client: reqwest::Client) -> Self {
+        Self {
+            baseurl: baseurl.to_string(),
+            client,
+        }
+    }
+
+    pub fn baseurl(&self) -> &String {
+        &self.baseurl
+    }
+
+    pub fn client(&self) -> &reqwest::Client {
+        &self.client
+    }
+}
+
+impl Client {
+    ///Gets a key
+    ///
+    ///Sends a `GET` request to `/key`
+    ///
+    ///Arguments:
+    /// - `key`: The same key parameter that overlaps with the path level
+    ///   parameter
+    /// - `unique_key`: A key parameter that will not be overridden by the path
+    ///   spec
+    ///
+    ///```ignore
+    /// let response = client.key_get()
+    ///    .key(key)
+    ///    .unique_key(unique_key)
+    ///    .send()
+    ///    .await;
+    /// ```
+    pub fn key_get(&self) -> builder::KeyGet {
+        builder::KeyGet::new(self)
+    }
+}
+
+pub mod builder {
+    use super::types;
+    #[allow(unused_imports)]
+    use super::{encode_path, ByteStream, Error, RequestBuilderExt, ResponseValue};
+    ///Builder for [`Client::key_get`]
+    ///
+    ///[`Client::key_get`]: super::Client::key_get
+    #[derive(Debug, Clone)]
+    pub struct KeyGet<'a> {
+        client: &'a super::Client,
+        key: Result<Option<bool>, String>,
+        unique_key: Result<Option<String>, String>,
+    }
+
+    impl<'a> KeyGet<'a> {
+        pub fn new(client: &'a super::Client) -> Self {
+            Self {
+                client,
+                key: Ok(None),
+                unique_key: Ok(None),
+            }
+        }
+
+        pub fn key<V>(mut self, value: V) -> Self
+        where
+            V: std::convert::TryInto<bool>,
+        {
+            self.key = value
+                .try_into()
+                .map(Some)
+                .map_err(|_| "conversion to `Option < bool >` for key failed".to_string());
+            self
+        }
+
+        pub fn unique_key<V>(mut self, value: V) -> Self
+        where
+            V: std::convert::TryInto<String>,
+        {
+            self.unique_key = value
+                .try_into()
+                .map(Some)
+                .map_err(|_| "conversion to `Option < String >` for unique_key failed".to_string());
+            self
+        }
+
+        ///Sends a `GET` request to `/key`
+        pub async fn send(self) -> Result<ResponseValue<()>, Error<()>> {
+            let Self {
+                client,
+                key,
+                unique_key,
+            } = self;
+            let key = key.map_err(Error::InvalidRequest)?;
+            let unique_key = unique_key.map_err(Error::InvalidRequest)?;
+            let url = format!("{}/key", client.baseurl,);
+            let mut query = Vec::new();
+            if let Some(v) = &key {
+                query.push(("key", v.to_string()));
+            }
+            if let Some(v) = &unique_key {
+                query.push(("uniqueKey", v.to_string()));
+            }
+            let request = client.client.get(url).query(&query).build()?;
+            let result = client.client.execute(request).await;
+            let response = result?;
+            match response.status().as_u16() {
+                200u16 => Ok(ResponseValue::empty(response)),
+                _ => Err(Error::UnexpectedResponse(response)),
+            }
+        }
+    }
+}
+
+pub mod prelude {
+    pub use super::Client;
+}
diff --git a/progenitor-impl/tests/output/param-overrides-builder.out b/progenitor-impl/tests/output/param-overrides-builder.out
new file mode 100644
index 0000000..e3dcf9a
--- /dev/null
+++ b/progenitor-impl/tests/output/param-overrides-builder.out
@@ -0,0 +1,141 @@
+#[allow(unused_imports)]
+use progenitor_client::{encode_path, RequestBuilderExt};
+pub use progenitor_client::{ByteStream, Error, ResponseValue};
+pub mod types {
+    use serde::{Deserialize, Serialize};
+    #[allow(unused_imports)]
+    use std::convert::TryFrom;
+}
+
+#[derive(Clone, Debug)]
+pub struct Client {
+    pub(crate) baseurl: String,
+    pub(crate) client: reqwest::Client,
+}
+
+impl Client {
+    pub fn new(baseurl: &str) -> Self {
+        let dur = std::time::Duration::from_secs(15);
+        let client = reqwest::ClientBuilder::new()
+            .connect_timeout(dur)
+            .timeout(dur)
+            .build()
+            .unwrap();
+        Self::new_with_client(baseurl, client)
+    }
+
+    pub fn new_with_client(baseurl: &str, client: reqwest::Client) -> Self {
+        Self {
+            baseurl: baseurl.to_string(),
+            client,
+        }
+    }
+
+    pub fn baseurl(&self) -> &String {
+        &self.baseurl
+    }
+
+    pub fn client(&self) -> &reqwest::Client {
+        &self.client
+    }
+}
+
+impl Client {
+    ///Gets a key
+    ///
+    ///Sends a `GET` request to `/key`
+    ///
+    ///Arguments:
+    /// - `key`: The same key parameter that overlaps with the path level
+    ///   parameter
+    /// - `unique_key`: A key parameter that will not be overridden by the path
+    ///   spec
+    ///
+    ///```ignore
+    /// let response = client.key_get()
+    ///    .key(key)
+    ///    .unique_key(unique_key)
+    ///    .send()
+    ///    .await;
+    /// ```
+    pub fn key_get(&self) -> builder::KeyGet {
+        builder::KeyGet::new(self)
+    }
+}
+
+pub mod builder {
+    use super::types;
+    #[allow(unused_imports)]
+    use super::{encode_path, ByteStream, Error, RequestBuilderExt, ResponseValue};
+    ///Builder for [`Client::key_get`]
+    ///
+    ///[`Client::key_get`]: super::Client::key_get
+    #[derive(Debug, Clone)]
+    pub struct KeyGet<'a> {
+        client: &'a super::Client,
+        key: Result<Option<bool>, String>,
+        unique_key: Result<Option<String>, String>,
+    }
+
+    impl<'a> KeyGet<'a> {
+        pub fn new(client: &'a super::Client) -> Self {
+            Self {
+                client,
+                key: Ok(None),
+                unique_key: Ok(None),
+            }
+        }
+
+        pub fn key<V>(mut self, value: V) -> Self
+        where
+            V: std::convert::TryInto<bool>,
+        {
+            self.key = value
+                .try_into()
+                .map(Some)
+                .map_err(|_| "conversion to `Option < bool >` for key failed".to_string());
+            self
+        }
+
+        pub fn unique_key<V>(mut self, value: V) -> Self
+        where
+            V: std::convert::TryInto<String>,
+        {
+            self.unique_key = value
+                .try_into()
+                .map(Some)
+                .map_err(|_| "conversion to `Option < String >` for unique_key failed".to_string());
+            self
+        }
+
+        ///Sends a `GET` request to `/key`
+        pub async fn send(self) -> Result<ResponseValue<()>, Error<()>> {
+            let Self {
+                client,
+                key,
+                unique_key,
+            } = self;
+            let key = key.map_err(Error::InvalidRequest)?;
+            let unique_key = unique_key.map_err(Error::InvalidRequest)?;
+            let url = format!("{}/key", client.baseurl,);
+            let mut query = Vec::new();
+            if let Some(v) = &key {
+                query.push(("key", v.to_string()));
+            }
+            if let Some(v) = &unique_key {
+                query.push(("uniqueKey", v.to_string()));
+            }
+            let request = client.client.get(url).query(&query).build()?;
+            let result = client.client.execute(request).await;
+            let response = result?;
+            match response.status().as_u16() {
+                200u16 => Ok(ResponseValue::empty(response)),
+                _ => Err(Error::UnexpectedResponse(response)),
+            }
+        }
+    }
+}
+
+pub mod prelude {
+    pub use self::super::Client;
+}
diff --git a/progenitor-impl/tests/output/param-overrides-positional.out b/progenitor-impl/tests/output/param-overrides-positional.out
new file mode 100644
index 0000000..7b565e0
--- /dev/null
+++ b/progenitor-impl/tests/output/param-overrides-positional.out
@@ -0,0 +1,80 @@
+#[allow(unused_imports)]
+use progenitor_client::{encode_path, RequestBuilderExt};
+pub use progenitor_client::{ByteStream, Error, ResponseValue};
+pub mod types {
+    use serde::{Deserialize, Serialize};
+    #[allow(unused_imports)]
+    use std::convert::TryFrom;
+}
+
+#[derive(Clone, Debug)]
+pub struct Client {
+    pub(crate) baseurl: String,
+    pub(crate) client: reqwest::Client,
+}
+
+impl Client {
+    pub fn new(baseurl: &str) -> Self {
+        let dur = std::time::Duration::from_secs(15);
+        let client = reqwest::ClientBuilder::new()
+            .connect_timeout(dur)
+            .timeout(dur)
+            .build()
+            .unwrap();
+        Self::new_with_client(baseurl, client)
+    }
+
+    pub fn new_with_client(baseurl: &str, client: reqwest::Client) -> Self {
+        Self {
+            baseurl: baseurl.to_string(),
+            client,
+        }
+    }
+
+    pub fn baseurl(&self) -> &String {
+        &self.baseurl
+    }
+
+    pub fn client(&self) -> &reqwest::Client {
+        &self.client
+    }
+}
+
+impl Client {
+    ///Gets a key
+    ///
+    ///Sends a `GET` request to `/key`
+    ///
+    ///Arguments:
+    /// - `key`: The same key parameter that overlaps with the path level
+    ///   parameter
+    /// - `unique_key`: A key parameter that will not be overridden by the path
+    ///   spec
+    pub async fn key_get<'a>(
+        &'a self,
+        key: Option<bool>,
+        unique_key: Option<&'a str>,
+    ) -> Result<ResponseValue<()>, Error<()>> {
+        let url = format!("{}/key", self.baseurl,);
+        let mut query = Vec::new();
+        if let Some(v) = &key {
+            query.push(("key", v.to_string()));
+        }
+
+        if let Some(v) = &unique_key {
+            query.push(("uniqueKey", v.to_string()));
+        }
+
+        let request = self.client.get(url).query(&query).build()?;
+        let result = self.client.execute(request).await;
+        let response = result?;
+        match response.status().as_u16() {
+            200u16 => Ok(ResponseValue::empty(response)),
+            _ => Err(Error::UnexpectedResponse(response)),
+        }
+    }
+}
+
+pub mod prelude {
+    pub use super::Client;
+}
diff --git a/progenitor-impl/tests/test_output.rs b/progenitor-impl/tests/test_output.rs
index 8bd129a..7abb38f 100644
--- a/progenitor-impl/tests/test_output.rs
+++ b/progenitor-impl/tests/test_output.rs
@@ -66,6 +66,11 @@ fn test_propolis_server() {
     verify_apis("propolis-server");
 }
 
+#[test]
+fn test_param_override() {
+    verify_apis("param-overrides");
+}
+
 // TODO this file is full of inconsistencies and incorrectly specified types.
 // It's an interesting test to consider whether we try to do our best to
 // interpret the intent or just fail.
diff --git a/sample_openapi/param-overrides.json b/sample_openapi/param-overrides.json
new file mode 100644
index 0000000..a5de3c8
--- /dev/null
+++ b/sample_openapi/param-overrides.json
@@ -0,0 +1,60 @@
+{
+  "openapi": "3.0.0",
+  "info": {
+    "description": "Minimal API for testing parameter overrides",
+    "title": "Parameter override test",
+    "version": "v1"
+  },
+  "paths": {
+    "/key": {
+      "get": {
+        "description": "Gets a key",
+        "operationId": "key.get",
+        "parameters": [
+          {
+            "description": "The same key parameter that overlaps with the path level parameter",
+            "in": "query",
+            "name": "key",
+            "schema": {
+              "type": "boolean"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "type": "string",
+            "description": "Successful response"
+          }
+        }
+      },
+      "parameters": [
+        {
+          "$ref": "#/components/parameters/key"
+        },
+        {
+          "$ref": "#/components/parameters/unique-key"
+        }
+      ]
+    }
+  },
+  "components": {
+    "parameters": {
+      "key": {
+        "description": "A key parameter that will be overridden by the path spec",
+        "in": "query",
+        "name": "key",
+        "schema": {
+          "type": "string"
+        }
+      },
+      "unique-key": {
+        "description": "A key parameter that will not be overridden by the path spec",
+        "in": "query",
+        "name": "uniqueKey",
+        "schema": {
+          "type": "string"
+        }
+      }
+    }
+  }
+}
\ No newline at end of file