Simen Key Grimsrud (born 22 March 1992) is a Norwegian ski jumper. He took a gold medal in the team competition at the 2012 Junior World Ski Championships.
In 2012 he also took his first Continental Cup podium, with a second place in Brotterode.In the World Cup he has finished once among the top 30, with a 28th place from Lillehammer in November 2012.