|Full name||Helgi Kolviðsson|
|Date of birth||13 September 1971|
|Place of birth||Reykjavík, Iceland|
|Height||1.80 m (5 ft 11 in)|
|1996–1998||SC Austria Lustenau||55||(2)|
|1998–2000||1. FSV Mainz 05||61||(0)|
|2000–2001||SSV Ulm 1846||29||(2)|
|2014–2015||SC Wiener Neustadt|
|* Senior club appearances and goals counted for the domestic league only|
He started his career with now defunct side ÍK in 1988, but when the club folded due to financial difficulties in 1991 Helgi transferred, with most of the side's players, to the newly created football division of the town's handball side, HK, and played there for a few seasons before moving abroad, becoming one of Iceland's few international footballers that have played in Iceland's lower leagues but never in the top league. Helgi spent the 1995–96 season with German side SC Pfullendorf, scoring twice in 30 matches, before joining Austrian club SC Austria Lustenau. In two seasons, he made 55 league appearances, netting twice. In 2000, he returned to Germany with 1. FSV Mainz 05 and spent two years with the Bundesliga outfit, during which time he played 61 games.
Helgi joined SSV Ulm 1846 for the 2000–01 campaign, before returning to Austria with FC Kärnten, where he made 77 appearances and scored five goals in three seasons. He ended his playing career with a second spell at Pfullendorf, playing 56 league matches between 2004 and 2007.
During the 1993 season, Helgi won two caps for the Iceland under-21 team, making his debut as a second-half substitute for Þórður Guðjónsson in the 2–1 win against Hungary on 15 June 1993. Three years later, he won his first senior international cap for Iceland, replacing Ólafur Þórðarson in the 0–3 away defeat to Russia on 9 February 1996. Over the next seven years, Helgi played a further 28 matches for his country before making his final appearance in the 0–0 friendly draw with Mexico on 20 November 2003.
Before the 2007–08 season, Helgi was appointed as an assistant manager at SC Pfullendorf. After the dismissal of Michael Feichtenbeiner in April 2008, he briefly took over as caretaker manager, but couldn't continue with the team after the season as he lacked a UEFA 'A' licence. From 2008 to 2010, he served again as an assistant coach under head coach Walter Schneck while acquiring his UEFA 'A' Licence. For the 2010–11 season, he was appointed head coach of the club but left at the end of the season to take over as head coach of the Austrian Football First League side Austria Lustenau. Austria Lustenau finished the 2012–13 season in the third place.
- As of Match played 17 November 2020
- "Helgi Kolviðsson". National-Football-Teams.com. Retrieved 15 June 2012.
- "Helgi Kolviðsson international appearances" (in Icelandic). Knattspyrnusamband Íslands (KSÍ). Archived from the original on 6 October 2014. Retrieved 15 June 2012.
- "Helgi þjálfar Pfullendorf" (in Icelandic). mbl.is. 3 May 2008. Retrieved 19 December 2012.
- "Helgi ráðinn aðalþjálfari Pfullendorf" (in Icelandic). visir.is. 9 June 2010. Retrieved 19 December 2012.
- "Helgi ráðinn þjálfari Austria Lustenau" (in Icelandic). mbl.is. 6 May 2011. Retrieved 19 December 2012.
- "Kolvidsson in Ried vorgestellt" (in German). Österreich. 4 June 2015. Retrieved 5 June 2015.
- "Helgi Kolvidsson übernimmt Liechtenstein" (in German). schwaebische.de. 18 December 2018. Retrieved 30 December 2018.