Antti Mikko Niemi (born 31 May 1972) is a Finnish football goalkeeper, who is currently a free agent. He has spent much of his career in the UK (both the SPL and Premier League), and in 2008 announced his retirement due to injury. However in 2009 he returned to sign for Premier League club Portsmouth FC although he did not make any appearances before leaving in 2010.
Niemi was born in Oulu, Finland and began his career with HJK Helsinki, where he made over 100 appearances in four years, before transferring to FC Copenhagen in 1995. Impressive performances over the next two years saw a transfer to Scotland with Glasgow club Rangers.
Niemi moved to Edinburgh to join Heart Of Midlothian in December 1999. He became a hero for Hearts fans in the three years he played at Tynecastle. He put in some fantastic performances which helped Hearts maintain their status as one of Scotland's best team outside the Old Firm. Niemi also became famous in Scotland for his fantastic ability to save penalties.