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) L.P.	Cayman Islands		99.9999	%*
ARIAD Pharmaceuticals (Japan) GK	Japan		100	%
ARIAD Pharmaceuticals (Luxembourg) S.à.r.l.	Luxembourg		100	%**
ARIAD Pharmaceuticals (Europe) Sàrl	Switzerland		100	%***
ARIAD Pharmaceuticals (France)	France		100	%***
ARIAD Pharmaceuticals (Germany) GmbH	Germany		100	%***
ARIAD Pharma (UK) Ltd.	United Kingdom		100	%***
ARIAD Pharmaceuticals (Italia) S.R.L.	Italy		100	%***
ARIAD Pharmaceuticals (Spain) S.L.U.	Spain		100	%***
ARIAD Pharmaceuticals (Australia) Pty Ltd	Australia		100	%***
ARIAD Pharmaceuticals (Benelux) B.V.	Netherlands		100	%***
ARIAD Pharmaceuticals (Austria) GmbH	Austria		100	%***
ARIAD Pharmaceuticals (Nordic) AB	Sweden		100	%***
ARIAD Pharmaceuticals (Canada) ULC	Canada		100	%***
ARIAD Pharmaceuticals (Denmark) ApS	Denmark		100	%***
ARIAD Pharmaceuticals (Finland) Oy	Finland		100	%***
A.P.I. ARIAD Pharmaceuticals (Israel) Ltd.	Israel		100	%***
ARIAD Pharmaceuticals (Norway) AS	Norway		100	%***

* The remaining 0.0001% of ARIAD Pharmaceuticals (Cayman) LP is owned by ARIAD Pharmaceuticals (Cayman) Inc.

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

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