diff --git a/orgs.go b/orgs.go
index 8001e86..6649795 100644
--- a/orgs.go
+++ b/orgs.go
@@ -3,6 +3,7 @@ package forge
 import (
 	"context"
 	"iter"
+	"net/http"
 
 	"dappco.re/go/core/forge/types"
 )
@@ -49,6 +50,43 @@ func (s *OrgService) RemoveMember(ctx context.Context, org, username string) err
 	return s.client.Delete(ctx, path)
 }
 
+// ListBlockedUsers returns all users blocked by an organisation.
+func (s *OrgService) ListBlockedUsers(ctx context.Context, org string) ([]types.User, error) {
+	path := ResolvePath("/api/v1/orgs/{org}/blocks", pathParams("org", org))
+	return ListAll[types.User](ctx, s.client, path, nil)
+}
+
+// IterBlockedUsers returns an iterator over all users blocked by an organisation.
+func (s *OrgService) IterBlockedUsers(ctx context.Context, org string) iter.Seq2[types.User, error] {
+	path := ResolvePath("/api/v1/orgs/{org}/blocks", pathParams("org", org))
+	return ListIter[types.User](ctx, s.client, path, nil)
+}
+
+// IsBlocked reports whether a user is blocked by an organisation.
+func (s *OrgService) IsBlocked(ctx context.Context, org, username string) (bool, error) {
+	path := ResolvePath("/api/v1/orgs/{org}/blocks/{username}", pathParams("org", org, "username", username))
+	resp, err := s.client.doJSON(ctx, "GET", path, nil, nil)
+	if err != nil {
+		if IsNotFound(err) {
+			return false, nil
+		}
+		return false, err
+	}
+	return resp.StatusCode == http.StatusNoContent, nil
+}
+
+// Block blocks a user within an organisation.
+func (s *OrgService) Block(ctx context.Context, org, username string) error {
+	path := ResolvePath("/api/v1/orgs/{org}/blocks/{username}", pathParams("org", org, "username", username))
+	return s.client.Put(ctx, path, nil, nil)
+}
+
+// Unblock unblocks a user within an organisation.
+func (s *OrgService) Unblock(ctx context.Context, org, username string) error {
+	path := ResolvePath("/api/v1/orgs/{org}/blocks/{username}", pathParams("org", org, "username", username))
+	return s.client.Delete(ctx, path)
+}
+
 // ListUserOrgs returns all organisations for a user.
 func (s *OrgService) ListUserOrgs(ctx context.Context, username string) ([]types.Organization, error) {
 	path := ResolvePath("/api/v1/users/{username}/orgs", pathParams("username", username))
diff --git a/orgs_test.go b/orgs_test.go
index 04dbdb3..eac1653 100644
--- a/orgs_test.go
+++ b/orgs_test.go
@@ -86,3 +86,90 @@ func TestOrgService_ListMembers_Good(t *testing.T) {
 		t.Errorf("got username=%q, want %q", members[0].UserName, "alice")
 	}
 }
+
+func TestOrgService_ListBlockedUsers_Good(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodGet {
+			t.Errorf("expected GET, got %s", r.Method)
+		}
+		if r.URL.Path != "/api/v1/orgs/core/blocks" {
+			t.Errorf("wrong path: %s", r.URL.Path)
+		}
+		w.Header().Set("X-Total-Count", "2")
+		json.NewEncoder(w).Encode([]types.User{
+			{ID: 1, UserName: "alice"},
+			{ID: 2, UserName: "bob"},
+		})
+	}))
+	defer srv.Close()
+
+	f := NewForge(srv.URL, "tok")
+	blocked, err := f.Orgs.ListBlockedUsers(context.Background(), "core")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(blocked) != 2 {
+		t.Fatalf("got %d blocked users, want 2", len(blocked))
+	}
+	if blocked[0].UserName != "alice" {
+		t.Errorf("got username=%q, want %q", blocked[0].UserName, "alice")
+	}
+}
+
+func TestOrgService_Block_Good(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPut {
+			t.Errorf("expected PUT, got %s", r.Method)
+		}
+		if r.URL.Path != "/api/v1/orgs/core/blocks/alice" {
+			t.Errorf("wrong path: %s", r.URL.Path)
+		}
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	defer srv.Close()
+
+	f := NewForge(srv.URL, "tok")
+	if err := f.Orgs.Block(context.Background(), "core", "alice"); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestOrgService_Unblock_Good(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodDelete {
+			t.Errorf("expected DELETE, got %s", r.Method)
+		}
+		if r.URL.Path != "/api/v1/orgs/core/blocks/alice" {
+			t.Errorf("wrong path: %s", r.URL.Path)
+		}
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	defer srv.Close()
+
+	f := NewForge(srv.URL, "tok")
+	if err := f.Orgs.Unblock(context.Background(), "core", "alice"); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestOrgService_IsBlocked_Good(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodGet {
+			t.Errorf("expected GET, got %s", r.Method)
+		}
+		if r.URL.Path != "/api/v1/orgs/core/blocks/alice" {
+			t.Errorf("wrong path: %s", r.URL.Path)
+		}
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	defer srv.Close()
+
+	f := NewForge(srv.URL, "tok")
+	blocked, err := f.Orgs.IsBlocked(context.Background(), "core", "alice")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !blocked {
+		t.Fatal("got blocked=false, want true")
+	}
+}