diff --git a/github/codespaces_machines.go b/github/codespaces_machines.go
new file mode 100644
index 00000000000..5277b1f4098
--- /dev/null
+++ b/github/codespaces_machines.go
@@ -0,0 +1,74 @@
+// Copyright 2025 The go-github AUTHORS. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package github
+
+import (
+	"context"
+	"fmt"
+)
+
+// CodespacesMachines represent a list of machines.
+type CodespacesMachines struct {
+	TotalCount int64                `json:"total_count"`
+	Machines   []*CodespacesMachine `json:"machines"`
+}
+
+// ListRepoMachineTypesOptions represent options for ListMachineTypesForRepository.
+type ListRepoMachineTypesOptions struct {
+	// Ref represent the branch or commit to check for prebuild availability and devcontainer restrictions.
+	Ref *string `url:"ref,omitempty"`
+	// Location represent the location to check for available machines. Assigned by IP if not provided.
+	Location *string `url:"location,omitempty"`
+	// ClientIP represent the IP for location auto-detection when proxying a request
+	ClientIP *string `url:"client_ip,omitempty"`
+}
+
+// ListRepositoryMachineTypes lists the machine types available for a given repository based on its configuration.
+//
+// GitHub API docs: https://docs.github.com/rest/codespaces/machines#list-available-machine-types-for-a-repository
+//
+//meta:operation GET /repos/{owner}/{repo}/codespaces/machines
+func (s *CodespacesService) ListRepositoryMachineTypes(ctx context.Context, owner, repo string, opts *ListRepoMachineTypesOptions) (*CodespacesMachines, *Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/codespaces/machines", owner, repo)
+	u, err := addOptions(u, opts)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var machines *CodespacesMachines
+	resp, err := s.client.Do(ctx, req, &machines)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return machines, resp, nil
+}
+
+// ListCodespaceMachineTypes lists the machine types a codespace can transition to use.
+//
+// GitHub API docs: https://docs.github.com/rest/codespaces/machines#list-machine-types-for-a-codespace
+//
+//meta:operation GET /user/codespaces/{codespace_name}/machines
+func (s *CodespacesService) ListCodespaceMachineTypes(ctx context.Context, codespaceName string) (*CodespacesMachines, *Response, error) {
+	u := fmt.Sprintf("user/codespaces/%v/machines", codespaceName)
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var machines *CodespacesMachines
+	resp, err := s.client.Do(ctx, req, &machines)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return machines, resp, nil
+}
diff --git a/github/codespaces_machines_test.go b/github/codespaces_machines_test.go
new file mode 100644
index 00000000000..d413d168b93
--- /dev/null
+++ b/github/codespaces_machines_test.go
@@ -0,0 +1,149 @@
+// Copyright 2025 The go-github AUTHORS. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package github
+
+import (
+	"fmt"
+	"net/http"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func TestCodespacesService_ListRepositoryMachineTypes(t *testing.T) {
+	t.Parallel()
+	client, mux, _ := setup(t)
+
+	mux.HandleFunc("/repos/owner/repo/codespaces/machines", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "GET")
+		testFormValues(t, r, values{
+			"ref":       "main",
+			"location":  "WestUs2",
+			"client_ip": "1.2.3.4",
+		})
+		fmt.Fprint(w, `{
+			"total_count": 1,
+			"machines": [
+				{
+					"name": "standardLinux",
+					"display_name": "4 cores, 8 GB RAM, 64 GB storage",
+					"operating_system": "linux",
+					"storage_in_bytes": 68719476736,
+					"memory_in_bytes": 17179869184,
+					"cpus": 4,
+					"prebuild_availability": "ready"
+				}
+			]
+		}`)
+	})
+
+	ctx := t.Context()
+	opts := &ListRepoMachineTypesOptions{
+		Ref:      Ptr("main"),
+		Location: Ptr("WestUs2"),
+		ClientIP: Ptr("1.2.3.4"),
+	}
+
+	got, _, err := client.Codespaces.ListRepositoryMachineTypes(
+		ctx,
+		"owner",
+		"repo",
+		opts,
+	)
+	if err != nil {
+		t.Fatalf("Codespaces.ListRepositoryMachineTypes returned error: %v", err)
+	}
+
+	want := &CodespacesMachines{
+		TotalCount: 1,
+		Machines: []*CodespacesMachine{
+			{
+				Name:                 Ptr("standardLinux"),
+				DisplayName:          Ptr("4 cores, 8 GB RAM, 64 GB storage"),
+				OperatingSystem:      Ptr("linux"),
+				StorageInBytes:       Ptr(int64(68719476736)),
+				MemoryInBytes:        Ptr(int64(17179869184)),
+				CPUs:                 Ptr(4),
+				PrebuildAvailability: Ptr("ready"),
+			},
+		},
+	}
+
+	if !cmp.Equal(got, want) {
+		t.Errorf("Codespaces.ListRepositoryMachineTypes returned %+v, want %+v", got, want)
+	}
+
+	const methodName = "ListRepositoryMachineTypes"
+	testBadOptions(t, methodName, func() error {
+		_, _, err := client.Codespaces.ListRepositoryMachineTypes(ctx, "\n", "/n", opts)
+		return err
+	})
+	testNewRequestAndDoFailure(t, methodName, client, func() (*Response, error) {
+		got, resp, err := client.Codespaces.ListRepositoryMachineTypes(ctx, "/n", "/n", opts)
+		if got != nil {
+			t.Errorf("testNewRequestAndDoFailure %v = %#v, want nil", methodName, got)
+		}
+		return resp, err
+	})
+}
+
+func TestCodespacesService_ListCodespaceMachineTypes(t *testing.T) {
+	t.Parallel()
+	client, mux, _ := setup(t)
+
+	mux.HandleFunc("/user/codespaces/codespace_1/machines", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "GET")
+
+		fmt.Fprint(w, `{
+			"total_count": 1,
+			"machines": [
+				{
+					"name": "standardLinux",
+					"display_name": "4 cores, 8 GB RAM, 64 GB storage",
+					"operating_system": "linux",
+					"storage_in_bytes": 68719476736,
+					"memory_in_bytes": 17179869184,
+					"cpus": 4,
+					"prebuild_availability": "ready"
+				}
+			]
+		}`)
+	})
+
+	ctx := t.Context()
+	got, _, err := client.Codespaces.ListCodespaceMachineTypes(ctx, "codespace_1")
+	if err != nil {
+		t.Fatalf("Codespaces.ListCodespaceMachineTypes returned error: %v", err)
+	}
+
+	want := &CodespacesMachines{
+		TotalCount: 1,
+		Machines: []*CodespacesMachine{
+			{
+				Name:                 Ptr("standardLinux"),
+				DisplayName:          Ptr("4 cores, 8 GB RAM, 64 GB storage"),
+				OperatingSystem:      Ptr("linux"),
+				StorageInBytes:       Ptr(int64(68719476736)),
+				MemoryInBytes:        Ptr(int64(17179869184)),
+				CPUs:                 Ptr(4),
+				PrebuildAvailability: Ptr("ready"),
+			},
+		},
+	}
+
+	if !cmp.Equal(got, want) {
+		t.Errorf("Codespaces.ListCodespaceMachineTypes returned %+v, want %+v", got, want)
+	}
+
+	const methodName = "ListCodespaceMachineTypes"
+	testNewRequestAndDoFailure(t, methodName, client, func() (*Response, error) {
+		got, resp, err := client.Codespaces.ListCodespaceMachineTypes(ctx, "/n")
+		if got != nil {
+			t.Errorf("testNewRequestAndDoFailure %v = %#v, want nil", methodName, got)
+		}
+		return resp, err
+	})
+}
diff --git a/github/github-accessors.go b/github/github-accessors.go
index b907c2af56a..8b24b058ed5 100644
--- a/github/github-accessors.go
+++ b/github/github-accessors.go
@@ -14678,6 +14678,30 @@ func (l *ListProvisionedSCIMUsersEnterpriseOptions) GetStartIndex() int {
 	return *l.StartIndex
 }
 
+// GetClientIP returns the ClientIP field if it's non-nil, zero value otherwise.
+func (l *ListRepoMachineTypesOptions) GetClientIP() string {
+	if l == nil || l.ClientIP == nil {
+		return ""
+	}
+	return *l.ClientIP
+}
+
+// GetLocation returns the Location field if it's non-nil, zero value otherwise.
+func (l *ListRepoMachineTypesOptions) GetLocation() string {
+	if l == nil || l.Location == nil {
+		return ""
+	}
+	return *l.Location
+}
+
+// GetRef returns the Ref field if it's non-nil, zero value otherwise.
+func (l *ListRepoMachineTypesOptions) GetRef() string {
+	if l == nil || l.Ref == nil {
+		return ""
+	}
+	return *l.Ref
+}
+
 // GetTotalCount returns the TotalCount field if it's non-nil, zero value otherwise.
 func (l *ListRepositories) GetTotalCount() int {
 	if l == nil || l.TotalCount == nil {
diff --git a/github/github-accessors_test.go b/github/github-accessors_test.go
index b12c405d2bf..dbd85d0dc7d 100644
--- a/github/github-accessors_test.go
+++ b/github/github-accessors_test.go
@@ -19095,6 +19095,39 @@ func TestListProvisionedSCIMUsersEnterpriseOptions_GetStartIndex(tt *testing.T)
 	l.GetStartIndex()
 }
 
+func TestListRepoMachineTypesOptions_GetClientIP(tt *testing.T) {
+	tt.Parallel()
+	var zeroValue string
+	l := &ListRepoMachineTypesOptions{ClientIP: &zeroValue}
+	l.GetClientIP()
+	l = &ListRepoMachineTypesOptions{}
+	l.GetClientIP()
+	l = nil
+	l.GetClientIP()
+}
+
+func TestListRepoMachineTypesOptions_GetLocation(tt *testing.T) {
+	tt.Parallel()
+	var zeroValue string
+	l := &ListRepoMachineTypesOptions{Location: &zeroValue}
+	l.GetLocation()
+	l = &ListRepoMachineTypesOptions{}
+	l.GetLocation()
+	l = nil
+	l.GetLocation()
+}
+
+func TestListRepoMachineTypesOptions_GetRef(tt *testing.T) {
+	tt.Parallel()
+	var zeroValue string
+	l := &ListRepoMachineTypesOptions{Ref: &zeroValue}
+	l.GetRef()
+	l = &ListRepoMachineTypesOptions{}
+	l.GetRef()
+	l = nil
+	l.GetRef()
+}
+
 func TestListRepositories_GetTotalCount(tt *testing.T) {
 	tt.Parallel()
 	var zeroValue int