Finnbjörn Þorvaldsson (25 May 1924 – 9 July 2018) was an Icelandic sprinter who competed in the 1948 Summer Olympics.
He was born in Hnífsdalur, Westfjords.Finnbjörn also competed in Handball and basketball.
He won the Icelandic national championship in handball in 1946 with Íþróttafélag Reykjavíkur after scoring the winning goal in ÍR's 20-19 victory against Haukar.
In 1954, Finnbjörn won the national championship in basketball with ÍR´s basketball team.