Gro Hammerseng-Edin (born 10 April 1980 in Gjøvik as Gro Hammerseng) is a Norwegian handballer playing for the club Larvik HK. She was captain of the Norwegian national team for several years, and in 2007 she was voted female World Handball Player of the Year.
Hammerseng started her handball career in 1990 at Gjøvik HK (1990–1995). She later played one year for Raufoss IL (1995–1996) and one year for Vardal IF (1996–1997) before starting her senior career in 1997 for Gjøvik og Vardal HK (1997–2003). Hammerseng was Gjøvik og Vardal's captain during her six seasons with the club. In 2003, after serious economic problems at her hometown club, Hammerseng signed with Danish top club Ikast-Bording, since November 2008 called FC Midtjylland Håndbold. Gro stayed 7 years in Denmark playing for the Danish club FC Midtjylland Håndbold, but on 17 February 2010 she signed under a 2-year contract with the Norwegian handball club Larvik HK. Gro has played for Larvik since the 2010/11 season and will end her career after the 2016/2017 season.