|Full name||Grétar Rafn Steinsson|
|Date of birth||9 January 1982|
|Place of birth||Siglufjörður, Iceland|
|Height||1.89 m (6 ft 2 1⁄2 in) |
|Playing position||Right back|
|* Senior club appearances and goals counted for the domestic league only.
† Appearances (Goals).
|This section requires expansion. (June 2012)|
He started his career with local team KS in Siglufjörður and later played for ÍA Akranes, winning the Icelandic league in 2001, before going abroad to play professionally for Swiss club BSC Young Boys. In 2005, Grétar signed for AZ Alkmaar as a replacement for Jan Kromkamp.
On 2 July 2007, AZ Alkmaar announced they had accepted a €3.5 million bid from Middlesbrough. Gareth Southgate had seen him as an ideal replacement for Stuart Parnaby. After the bid was accepted, however, AZ backtracked, claiming the price wasn't high enough and requested Middlesbrough to raise their bid to £4m. Instead, Middlesbrough turned their attention to Charlton Athletic right back Luke Young, who ended up making the move, ending Middlesbrough's interest in Grétar.
Despite signing a new four-and-a-half-year contract with AZ in November 2007, Grétar signed for Bolton Wanderers on 16 January 2008 for a £3.5m fee. He made his debut against Newcastle United on the 19 January 2008.
Gary Megson and his side picked up a win against Middlesbrough, a draw against Tottenham, a win against Sunderland and a 1–1 draw against Chelsea to keep them up which could have also decided who won the Premier League title. He scored his first goal for Bolton in the 3–1 victory over Stoke City on 16 August 2008. In the last but one game of the season, Grétar's goal in a 1-1 draw against Hull City confirmed Bolton's Premier League survival.
At the start of the 2010-11 season, Grétar changed his squad number from 15 to 2. He scored in the 3-1 home win against Liverpool on 21 January 2012. At the end of the 2011-12 season Bolton were relegated and the club elected not to offer Steinsson a new contract.
On 27 September 2013 Grétar announced that he had retired from football. 
He also plays regularly for the Iceland national football team. He made his debut in a March 2002 friendly match against Brazil as a substitute and scored after being only 17 minutes on the pitch. He also represented Iceland at all youth levels.
Grétar married his former wife Manuela Ósk Harðardóttir in 2007 and got divorced in 2011. Manuela has one son from a previous relationship. Manuela will get 50% of Grétars wages while he plays as a footballer until she marries again or gets a full job.
Manuela was crowned Miss Reykjavik and Miss Iceland 2002. She represented Iceland in Miss Scandinavia where she came 1st runner up. She also represented her country in Miss Universe 2003 but was hospitalized due to dehydration and could not compete.
They have a son called Johann and a daughter, Elma Rós, who was born in April 2010.
- "Premier League Player Profile". Premier League. Retrieved 16 March 2011.
- Van Leeuwen, Gerri. "AZ bag defender". Sky Sports. Retrieved 2012-08-30.
- Glorie, Jeffrey (2007-11-04). "AZ ace eyes England future". Sky Sports. Retrieved 2012-08-27.
- "Defender Steinsson joins Bolton". BBC Sport. 2008-01-16. Retrieved 2008-01-16.
- "Bolton 3–1 Stoke". BBC Sport. 2008-08-16. Retrieved 2008-08-16.
- "Tigers climb out of drop zone". Sky Sports. 2009-05-16. Retrieved 2012-08-30.
- "Steinsson'dan Kayserispor'a 2 yıllık imza" [Steinsson signs for Kayserispor for 2 years] (in Turkish). NTVSpor.net. 2012-08-22. Retrieved 2012-08-30.
- "Oh baby, Gretar is back in business". Bolton News. 2010-05-03. Retrieved 2010-05-03.