| Marvin Valdimarsson | |
| Birth Date: | 11 August 1981 |
| Birth Place: | Iceland |
| Height Cm: | 198 |
| Weight Kg: | 85 |
| Position: | Small forward |
| Nationality: | Icelandic |
| Career Start: | 1997 |
| Career End: | 2018 |
| Years1: | 1997–2002 |
| Team1: | UMF Selfoss |
| Years2: | 2002–2005 |
| Team2: | Hamar |
| Years3: | 2005–2006 |
| Team3: | Fjölnir |
| Years4: | 2007 |
| Team4: | Hamar/Selfoss |
| Years5: | 2007–2010 |
| Team5: | Hamar |
| Years6: | 2010–2018 |
| Team6: | Stjarnan |
| Years7: | 2018 |
| Team7: | Ungmennafélag Álftaness |
| Highlights: |
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Marvin Valdimarsson (born 11 August 1981) is an Icelandic former basketball player. At the peak of his career, he was known as a high-scoring forward,[1] leading the 1. deild karla in scoring in 2009,[2] when he was also named as the Player of the Year,[3] and coming in second in scoring in the Úrvalsdeild karla in 2010.[4] After joining Stjarnan in 2010,[5] he won the Icelandic Basketball Cup twice, in 2013 and 2015.[6] In 2015, he won the last edition of the Icelandic Company Cup.[7] He last played for Ungmennafélag Álftaness in 2018.[8]
Marvin's brother is basketball player Sæmundur Valdimarsson.[9]