According to Variety, the famous businessman will appear in the upcoming season finale.
He is expected to play one of the people being interviewed as a potential replacement for Michael Scott (Steve Carell).
Buffett is said to be a big fan of The Office and allegedly commissioned a special sketch from the cast, which he showed at his company's annual shareholders meeting last month.
A number of stars have already signed up to appear in the season finale, including Jim Carrey, Catherine Tate, Ray Romano, James Spader, Will Arnett and Ricky Gervais.
The Office, which has already been renewed, airs on Thursdays at 9/8c on NBC.