diff --git a/github/repos_collaborators.go b/github/repos_collaborators.go
new file mode 100644
index 0000000..2972281
--- /dev/null
+++ b/github/repos_collaborators.go
@@ -0,0 +1,69 @@
+// Copyright 2013 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"
+)
+
+// ListCollaborators lists the Github users that have access to the repository.
+//
+// GitHub API docs: http://developer.github.com/v3/repos/collaborators/#list
+func (s *RepositoriesService) ListCollaborators(owner, repo string) ([]User, *Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/collaborators", owner, repo)
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	users := new([]User)
+	resp, err := s.client.Do(req, users)
+	return *users, resp, err
+}
+
+// IsCollaborator checks whether the specified Github user has collaborator
+// access to the given repo.
+// Note: This will return false if the user is not a collaborator OR the user
+// is not a GitHub user.
+//
+// GitHub API docs: http://developer.github.com/v3/repos/collaborators/#get
+func (s *RepositoriesService) IsCollaborator(owner, repo, user string) (bool, *Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/collaborators/%v", owner, repo, user)
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return false, nil, err
+	}
+	resp, err := s.client.Do(req, nil)
+	isCollab, err := parseBoolResponse(err)
+	return isCollab, resp, err
+}
+
+// AddCollaborator adds the specified Github user as collaborator to the given repo.
+//
+// GitHub API docs: http://developer.github.com/v3/repos/collaborators/#add-collaborator
+func (s *RepositoriesService) AddCollaborator(owner, repo, user string) (*Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/collaborators/%v", owner, repo, user)
+	req, err := s.client.NewRequest("PUT", u, nil)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := s.client.Do(req, nil)
+	return resp, err
+}
+
+// RemoveCollaborator removes the specified Github user as collaborator from the given repo.
+// Note: Does not return error if a valid user that is not a collaborator is removed.
+//
+// GitHub API docs: http://developer.github.com/v3/repos/collaborators/#remove-collaborator
+func (s *RepositoriesService) RemoveCollaborator(owner, repo, user string) (*Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/collaborators/%v", owner, repo, user)
+	req, err := s.client.NewRequest("DELETE", u, nil)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := s.client.Do(req, nil)
+	return resp, err
+}
diff --git a/github/repos_collaborators_test.go b/github/repos_collaborators_test.go
new file mode 100644
index 0000000..010a2bc
--- /dev/null
+++ b/github/repos_collaborators_test.go
@@ -0,0 +1,101 @@
+// Copyright 2013 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"
+	"reflect"
+	"testing"
+)
+
+func TestRepositoriesService_ListCollaborators(t *testing.T) {
+	setup()
+	defer teardown()
+
+	mux.HandleFunc("/repos/o/r/collaborators", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "GET")
+		fmt.Fprintf(w, `[{"id":1}, {"id":2}]`)
+	})
+
+	users, _, err := client.Repositories.ListCollaborators("o", "r")
+	if err != nil {
+		t.Errorf("Repositories.ListCollaborators returned error: %v", err)
+	}
+
+	want := []User{User{ID: 1}, User{ID: 2}}
+	if !reflect.DeepEqual(users, want) {
+		t.Errorf("Repositories.ListCollaborators returned %+v, want %+v", users, want)
+	}
+}
+
+func TestRepositoriesService_IsCollaborator_True(t *testing.T) {
+	setup()
+	defer teardown()
+
+	mux.HandleFunc("/repos/o/r/collaborators/u", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "GET")
+		w.WriteHeader(http.StatusNoContent)
+	})
+
+	isCollab, _, err := client.Repositories.IsCollaborator("o", "r", "u")
+	if err != nil {
+		t.Errorf("Repositories.IsCollaborator returned error: %v", err)
+	}
+
+	if !isCollab {
+		t.Errorf("Repositories.IsCollaborator returned false, want true")
+	}
+}
+
+func TestRepositoriesService_IsCollaborator_False(t *testing.T) {
+	setup()
+	defer teardown()
+
+	mux.HandleFunc("/repos/o/r/collaborators/u", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "GET")
+		w.WriteHeader(http.StatusNotFound)
+	})
+
+	isCollab, _, err := client.Repositories.IsCollaborator("o", "r", "u")
+	if err != nil {
+		t.Errorf("Repositories.IsCollaborator returned error: %v", err)
+	}
+
+	if isCollab {
+		t.Errorf("Repositories.IsCollaborator returned true, want false")
+	}
+}
+
+func TestRepositoriesService_AddCollaborator(t *testing.T) {
+	setup()
+	defer teardown()
+
+	mux.HandleFunc("/repos/o/r/collaborators/u", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "PUT")
+		w.WriteHeader(http.StatusNoContent)
+	})
+
+	_, err := client.Repositories.AddCollaborator("o", "r", "u")
+	if err != nil {
+		t.Errorf("Repositories.AddCollaborator returned error: %v", err)
+	}
+}
+
+func TestRepositoriesService_RemoveCollaborator(t *testing.T) {
+	setup()
+	defer teardown()
+
+	mux.HandleFunc("/repos/o/r/collaborators/u", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "DELETE")
+		w.WriteHeader(http.StatusNoContent)
+	})
+
+	_, err := client.Repositories.RemoveCollaborator("o", "r", "u")
+	if err != nil {
+		t.Errorf("Repositories.RemoveCollaborator returned error: %v", err)
+	}
+}