Cohen has been reluctant to make appearances as himself, preferring to do interviews as the star of the faux documentary Borat: Cultural Learnings of America for Make Benefit Glorious Nation of Kazakhstan.
Oscar broadcast producer Laura Ziskin tells the Los Angeles Times, "He was asked, but he declined."
There had been speculation that the comedian's participation in the ceremony would bring a welcome shot of excitement to the broadcast.
Cohen's acceptance speech at the Golden Globe ceremony last month was one of the most talked-about events of the night.
When he won an acting award, he paid homage to his costar Ken Davitian's naked backside, which was part of a memorable moment in the film.
Although Cohen passed on presenting, he could still appear on stage if the film wins for Best Adapted Screenplay.
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