| Heiðar Geir Júlíusson | |
| Birth Date: | 16 August 1987 |
| Birth Place: | Akureyri, Iceland |
| Height: | 1.74 m |
| Currentclub: | Tromsdalen (assistant) |
| Position: | Midfielder |
| Years1: | 2005–2007 |
| Clubs1: | Fram Reykjavik |
| Caps1: | 65 |
| Goals1: | 7 |
| Years2: | 2007 |
| Clubs2: | Hammarby IF |
| Caps2: | 9 |
| Goals2: | 1 |
| Years3: | 2008–2009 |
| Clubs3: | Fram Reykjavik |
| Caps3: | 55 |
| Goals3: | 6 |
| Years4: | 2010–2012 |
| Clubs4: | Ängelholms FF |
| Caps4: | 34 |
| Goals4: | 5 |
| Years5: | 2013 |
| Clubs5: | Fylkir |
| Caps5: | 6 |
| Goals5: | 0 |
| Years6: | 2013 |
| Clubs6: | IFK Uddevalla |
| Caps6: | 2 |
| Goals6: | 0 |
| Years7: | 2014 |
| Clubs7: | Þróttur |
| Caps7: | 0 |
| Goals7: | 0 |
| Years8: | 2014 |
| Clubs8: | → Ham Kam (loan) |
| Caps8: | 15 |
| Goals8: | 0 |
| Years9: | 2015 |
| Clubs9: | IK Brage |
| Caps9: | 24 |
| Goals9: | 4 |
| Years10: | 2016 |
| Clubs10: | IK Gauthiod |
| Years11: | 2017– |
| Clubs11: | Þróttur |
| Caps11: | 0 |
| Goals11: | 0 |
| Nationalyears1: | 2003–2004 |
| Nationalteam1: | Iceland U17 |
| Nationalcaps1: | 6 |
| Nationalgoals1: | 0 |
| Nationalyears2: | 2004–2005 |
| Nationalteam2: | Iceland U19 |
| Nationalcaps2: | 7 |
| Nationalgoals2: | 0 |
| Nationalyears3: | 2006–2008 |
| Nationalteam3: | Iceland U21 |
| Nationalcaps3: | 9 |
| Nationalgoals3: | 0 |
| Club-Update: | 2 March 2016 |
| Manageryears1: | 2020–2022 |
| Managerclubs1: | Kvik Halden (coach/assistant) |
| Manageryears2: | 2022 |
| Managerclubs2: | Kvik Halden |
| Manageryears3: | 2023 |
| Managerclubs3: | Ørn Horten |
| Manageryears4: | 2024– |
| Managerclubs4: | Tromsdalen (assistant) |
Heiðar Geir Júlíusson (born 16 August 1987) is an Icelandic footballer and manager who played as a midfielder.
He joined the coaching staff of Kvik Halden FK in 2020. In early 2022, he became acting head coach after Jørgen La Cour Strand had to take a health leave. After guiding Kvik Halden through 2022, Júlíusson did not reach an agreement regarding a continued deal. Instead, he signed for FK Ørn Horten as their new head coach.[1] [2] [3] [4] He left Ørn to become assistant manager of Tromsdalen UIL in 2024.[5]