Exhibit 21

Subsidiaries of Northwest Bancshares, Inc.

• Northwest Bank, a Pennsylvania-chartered savings bank

• Northwest Bancorp Capital Trust III, a Delaware statutory business trust

• Northwest Bancorp Statutory Trust IV, a Connecticut statutory business trust

• LNB Trust II, a Delaware statutory business trust

• Union National Capital Trust I, a Delaware statutory business trust

• Union National Capital Trust II, a Delaware statutory business trust

Subsidiaries of Northwest Bank

• Northwest Financial Services, Inc., a Pennsylvania corporation

• Northwest Capital Group, Inc., a Pennsylvania corporation

• Allegheny Services, Inc., a Delaware corporation

• Great Northwest Corporation, a Pennsylvania corporation

• The Bert Company (doing business as Northwest Insurance Services), a Pennsylvania corporation