Star of Borat, Bruno and Ali G to portray violent Mariners supporter.
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Several images of Sacha Baron Cohen filming his new movie have been picked up by 101greatgoals.com.
The film does not yet have a working title, but it is scheduled for release in July 2015.
It features a secret agent who discovers that he has a long-lost hooligan brother, with whom he must team up.
Grimsby is not expected to be glorified by the film, which could mock the seaside town in a similar way to how Borat ridiculed Kazakhstan.
Check out some images of Baron Cohen in his latest role below.
Grimsby are currently in the Conference Premier, one division below the Football League.