Marel Jóhann Baldvinsson (born 18 December 1980) is an Icelandic football forward who last played for Stjarnan.
In January 2003 he was sold to the Belgian club Lokeren for just half of what Stabæk paid for him, 300,000 Euro, but with a clause giving 25% of the total transition in a later resale.
After many impressive displays in the 2006 season, he was recalled into the Icelandic national team to face Spain in August 2006.
A few days later he returned to professional football when he signed for Norwegian club Molde, in a deal worth 1,5 million Euro.
Marel made his debut for Iceland in an August 2001 friendly match against Poland, coming on as a substitute for Tryggvi Guðmundsson.