| Lasse Olsen | |
| Birth Date: | 18 November 1973 |
| Birth Place: | Oslo, Norway |
| Height: | 1.84 m |
| Position: | Forward |
| Youthyears1: | 1980–1991 |
| Youthyears2: | 1991–1992 |
| Youthclubs1: | Gjelleråsen |
| Youthclubs2: | Vålerenga |
| Years1: | 1993–1997 |
| Clubs1: | Gjelleråsen |
| Years2: | 1997–2004 |
| Clubs2: | Strømsgodset |
| Caps2: | 229 |
| Goals2: | 63 |
| Years3: | 2004–2008 |
| Clubs3: | Aalesund |
| Caps3: | 92 |
| Goals3: | 19 |
| Years4: | 2009–2010 |
| Clubs4: | Herd |
| Years5: | 2010–2011 |
| Clubs5: | Mjøndalen |
| Caps5: | 6 |
| Goals5: | 0 |
| Years6: | 2012 |
| Clubs6: | Herd |
| Years7: | 2013 |
| Clubs7: | Spjelkavik |
| Years8: | 2018 |
| Clubs8: | Averøykameratene |
| Years9: | 2019 |
| Clubs9: | Tomrefjord |
| Years10: | 2021 |
| Clubs10: | Valder |
| Manageryears1: | –2017 |
| Managerclubs1: | Herd (youth) |
| Manageryears2: | 2018 |
| Managerclubs2: | Averøykameratene |
| Manageryears3: | 2019 |
| Managerclubs3: | Tomrefjord |
| Manageryears4: | 2021 |
| Managerclubs4: | Valder |
Lasse Olsen (born 18 November 1973) is a Norwegian former footballer who played as a forward for Gjelleråsen, Strømsgodset, Aalesund, and Mjøndalen.
He is the son of former Vålerenga player Terje Olsen.[1]
After the 2008 season, his contract with Aalesund was not renewed. He initially contemplated retirement,[2] but in late December he was signed by SK Herd together with former teammate Karl Oskar Fjørtoft.[3] From 2012 he continued to play in the lower divisions of Møre og Romsdal.
Embarking on a manager career, he remained as junior and B team coach in SK Herd.[4] He managed Averøykameratene in 2018 before moving on to Tomrefjord.[5] He was hired in IL Valder on a two-year contract ahead of the 2021 season, but was fired after relegation from the 2021 4. divisjon.[6]