|Full name||Hallgrímur Jónasson|
|Date of birth||4 May 1986|
|Place of birth||Húsavík, Iceland|
|Height||1.84 m (6 ft 1⁄2 in)|
|Playing position||Centre back|
|2011||→ SønderjyskE (loan)||15||(1)|
* Senior club appearances and goals counted for the domestic league only and correct as of 8 November 2015.
Hallgrímur was born at Húsavík and his youth club is Völsungur. With them he managed to play only one season in 2nd division (2002) when he was 16 years old. He then moved to Þór Akureyri and was with them for 3 seasons in 1st division before moving with this coach from Þór to Keflavík who played in the Icelandic Premier league. With Keflavík, Hallgrímur made a name for himself and was used as a left back, central defender, central midfielder and as a right winger. He made his debut with the Icelandic national team on 16 March 2008 against Faroe Islands and played 10 games for the U21 national team and captained the team as well.
Played with them through their youth system and one season with the first team in 2002, then 16 years old. He played 12 matches and scored 3 goals.
With Þór, he played for 3 seasons, 35 matches and 3 goals. At Þór his coach was Kristján Guðmundsson who moved on to manage Keflavík and took Hallgrímur with him.
At Keflavík, Hallgrímur played 49 matches and scored 4 goals. He mainly played as a central defender or midfielder and made a name for himself in Iceland there.
Hallgrímur was signed to GAIS by Magnus Pehrsson who never managed him as he moved on to AaB in Denmark. Hallgrímur had an operation in November 2008 and therefore missed the whole pre-season for the 2009 season. In the end of his first season Hallgrimur secured a place in the starting line up and played 5 matches that season. In the following season, Hallgrímur was ever present in the starting line up and is now considered a key player for the team as a central defender.
Current as of February 24, 2012.
|1||7 October 2011||Estádio do Dragão, Porto, Portugal||Portugal||1–3||3–5||UEFA Euro 2012 qualifying|
|2||7 October 2011||Estádio do Dragão, Porto, Portugal||Portugal||2–3||3–5||UEFA Euro 2012 qualifying|
|3||30 May 2012||Gamla Ullevi, Gothenburg, Sweden||Sweden||2–3||2–3||Friendly|
- Lyngby forstærker defensiven med OB-stopper, bold.dk, 14 June 2016