Exhibit 21.1

SUBSIDIARIES OF ARIAD PHARMACEUTICALS, INC.

Subsidiary	Jurisdiction of Organization	% Owned
ARIAD Pharma S.A.	Greece		100	%
ARIAD Pharma Ltd.	United Kingdom		100	%
ARIAD Securities Corporation	Massachusetts, United States		100	%
ARIAD Pharmaceuticals (Cayman) Inc.	Cayman Islands		100	%
ARIAD Pharmaceuticals (Cayman) LP	Cayman Islands		99.9	%*
ARIAD Pharmaceuticals (Luxembourg) Sàrl	Luxembourg		100	%**
ARIAD Pharmaceuticals (Europe) Sàrl	Switzerland		100	%***
ARIAD Pharmaceuticals (France) Sàrl	France		100	%***
ARIAD Pharmaceuticals (Germany) GmbH	Germany		100	%***
ARIAD Pharma (UK) Ltd	United Kingdom		100	%***
ARIAD Pharmaceuticals (Italia) SRL	Italy		100	%***
ARIAD Pharmaceuticals (Spain) SL	Spain		100	%***

* The remaining 0.1% of ARIAD Pharmaceuticals (Cayman) LP is owned by ARIAD Pharmaceuticals, Inc.

** ARIAD Pharmaceuticals (Luxembourg) Sàrl is owned 100% by ARIAD Pharmaceuticals (Cayman) LP.

*** These subsidiaries are owned 100% by ARIAD Pharmaceuticals (Luxembourg) Sàrl.