Saara Elisa Niemi (née Tuominen; born 1 January 1986) is a female ice hockey player. At the 2006 Torino Olympics, Tuominen competed for Finland. scoring one goal and four assists. She was an assistant captain for Finland's women's ice hockey team at the 2010 Winter Olympics in Vancouver where the Finns won the bronze medal.
She graduated in 2010 from the University of Minnesota Duluth (UMD) and was a three-year captain for the UMD Bulldogs, NCAA Division I national champions in 2001, 2002, 2003, 2008 and 2010. She was a 2009 and 2010 WCHA All-Academic Team member, a 2008 All-WCHA Third Team selection and a member of the 2007 All-WCHA Rookie Team.
After graduation, she joined the Minnesota Whitecaps for their 2010–11 season. On 8 October, against former WCHA rival Minnesota Golden Gophers, Tuominen scored a goal. The following day, against former WCHA rival St. Cloud State, she scored a goal.