diff --git a/github/orgs_users_blocking.go b/github/orgs_users_blocking.go
new file mode 100644
index 00000000000..b1aecf44532
--- /dev/null
+++ b/github/orgs_users_blocking.go
@@ -0,0 +1,91 @@
+// Copyright 2017 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"
+)
+
+// ListBlockedUsers lists all the users blocked by an organization.
+//
+// GitHub API docs: https://developer.github.com/v3/orgs/blocking/#list-blocked-users
+func (s *OrganizationsService) ListBlockedUsers(ctx context.Context, org string, opt *ListOptions) ([]*User, *Response, error) {
+	u := fmt.Sprintf("orgs/%v/blocks", org)
+	u, err := addOptions(u, opt)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// TODO: remove custom Accept header when this API fully launches.
+	req.Header.Set("Accept", mediaTypeBlockUsersPreview)
+
+	var blockedUsers []*User
+	resp, err := s.client.Do(ctx, req, &blockedUsers)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return blockedUsers, resp, nil
+}
+
+// IsBlocked reports whether specified user is blocked from an organization.
+//
+// GitHub API docs: https://developer.github.com/v3/orgs/blocking/#check-whether-a-user-is-blocked-from-an-organization
+func (s *OrganizationsService) IsBlocked(ctx context.Context, org string, user string) (bool, *Response, error) {
+	u := fmt.Sprintf("orgs/%v/blocks/%v", org, user)
+
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return false, nil, err
+	}
+
+	// TODO: remove custom Accept header when this API fully launches.
+	req.Header.Set("Accept", mediaTypeBlockUsersPreview)
+
+	resp, err := s.client.Do(ctx, req, nil)
+	isBlocked, err := parseBoolResponse(err)
+	return isBlocked, resp, err
+}
+
+// BlockUser blocks specified user from an organization.
+//
+// GitHub API docs: https://developer.github.com/v3/orgs/blocking/#block-a-user
+func (s *OrganizationsService) BlockUser(ctx context.Context, org string, user string) (*Response, error) {
+	u := fmt.Sprintf("orgs/%v/blocks/%v", org, user)
+
+	req, err := s.client.NewRequest("PUT", u, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	// TODO: remove custom Accept header when this API fully launches.
+	req.Header.Set("Accept", mediaTypeBlockUsersPreview)
+
+	return s.client.Do(ctx, req, nil)
+}
+
+// UnblockUser unblocks specified user from an organization.
+//
+// GitHub API docs: https://developer.github.com/v3/orgs/blocking/#unblock-a-user
+func (s *OrganizationsService) UnblockUser(ctx context.Context, org string, user string) (*Response, error) {
+	u := fmt.Sprintf("orgs/%v/blocks/%v", org, user)
+
+	req, err := s.client.NewRequest("DELETE", u, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	// TODO: remove custom Accept header when this API fully launches.
+	req.Header.Set("Accept", mediaTypeBlockUsersPreview)
+
+	return s.client.Do(ctx, req, nil)
+}
diff --git a/github/orgs_users_blocking_test.go b/github/orgs_users_blocking_test.go
new file mode 100644
index 00000000000..53be507ef21
--- /dev/null
+++ b/github/orgs_users_blocking_test.go
@@ -0,0 +1,90 @@
+// Copyright 2017 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"
+	"net/http"
+	"reflect"
+	"testing"
+)
+
+func TestOrganizationsService_ListBlockedUsers(t *testing.T) {
+	setup()
+	defer teardown()
+
+	mux.HandleFunc("/orgs/o/blocks", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "GET")
+		testHeader(t, r, "Accept", mediaTypeBlockUsersPreview)
+		testFormValues(t, r, values{"page": "2"})
+		fmt.Fprint(w, `[{
+			"login": "octocat"
+		}]`)
+	})
+
+	opt := &ListOptions{Page: 2}
+	blockedUsers, _, err := client.Organizations.ListBlockedUsers(context.Background(), "o", opt)
+	if err != nil {
+		t.Errorf("Organizations.ListBlockedUsers returned error: %v", err)
+	}
+
+	want := []*User{{Login: String("octocat")}}
+	if !reflect.DeepEqual(blockedUsers, want) {
+		t.Errorf("Organizations.ListBlockedUsers returned %+v, want %+v", blockedUsers, want)
+	}
+}
+
+func TestOrganizationsService_IsBlocked(t *testing.T) {
+	setup()
+	defer teardown()
+
+	mux.HandleFunc("/orgs/o/blocks/u", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "GET")
+		testHeader(t, r, "Accept", mediaTypeBlockUsersPreview)
+		w.WriteHeader(http.StatusNoContent)
+	})
+
+	isBlocked, _, err := client.Organizations.IsBlocked(context.Background(), "o", "u")
+	if err != nil {
+		t.Errorf("Organizations.IsBlocked returned error: %v", err)
+	}
+	if want := true; isBlocked != want {
+		t.Errorf("Organizations.IsBlocked returned %+v, want %+v", isBlocked, want)
+	}
+}
+
+func TestOrganizationsService_BlockUser(t *testing.T) {
+	setup()
+	defer teardown()
+
+	mux.HandleFunc("/orgs/o/blocks/u", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "PUT")
+		testHeader(t, r, "Accept", mediaTypeBlockUsersPreview)
+		w.WriteHeader(http.StatusNoContent)
+	})
+
+	_, err := client.Organizations.BlockUser(context.Background(), "o", "u")
+	if err != nil {
+		t.Errorf("Organizations.BlockUser returned error: %v", err)
+	}
+}
+
+func TestOrganizationsService_UnblockUser(t *testing.T) {
+	setup()
+	defer teardown()
+
+	mux.HandleFunc("/orgs/o/blocks/u", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "DELETE")
+		testHeader(t, r, "Accept", mediaTypeBlockUsersPreview)
+		w.WriteHeader(http.StatusNoContent)
+	})
+
+	_, err := client.Organizations.UnblockUser(context.Background(), "o", "u")
+	if err != nil {
+		t.Errorf("Organizations.UnblockUser returned error: %v", err)
+	}
+}