Mark Ruffalo doesn’t think he’ll be pulled in for many auditions if Paramount and Warner Bros. merge … because, according to him, David and Larry Ellison aren’t the “forgive and forget” types.

The actor talked about Paramount Skydance’s controversial acquisition on a new episode of the “I’ve Had It” podcast … joking that he’s “already on a list” after his open letter opposing the merger gained thousands of signatures.

Ruffalo says the Ellisons spark a lot of fear in people … quoting one person who told him “these are some vindictive motherf***ers, the Ellisons.”

Two types of people are signing the open letter, Ruffalo says … people like him — big stars who have the privilege to oppose the merger — and production people who simply can’t afford not to.

As you know … Paramount — led by CEO David Ellison — has thrown down $110 Billion to acquire WB after Netflix’s $82.7 Billion offer was ultimately turned down. Many in the film industry have decried the move and have called on the government to deny the merger, citing antitrust laws.