Antti-Jussi Jormanpoika Niemi (born 22 September 1977) is a Finnish former professional ice hockey player.

Niemi played for Jokerit of the SM-liiga, the Mighty Ducks of Anaheim in the National Hockey League, HC Lada Togliatti in the Kontinental Hockey League and Västra Frölunda HC and Leksands IF of the Swedish Elitserien.

In June 1999, the Senators traded his NHL rights to the Mighty Ducks of Anaheim, along with Ted Donato for Patrick Lalime.

Niemi was member of the Finnish national team at several World Championships, as well as the 2006 Winter Olympics.

This biographical article relating to a Finnish ice hockey defenceman is a stub.