Bradley Cooper, Liam Neeson -- Keep Us Off that Big Screen!

Bradley Cooper and Liam Neeson love being on the big screen ... well all except one, and they're royally pissed off.

The two stars have filed a lawsuit against two home theater companies, claiming they plastered their pics on advertisements without permission. The ads show a screen grab from "The A-Team" featuring the 2 actors on a big projection screen.

Aside from the fact that "The A-Team" is no way to sell a movie product ... Cooper/Neeson want Vutec Corp. and First Impressions Theme Theaters to stop the ads STAT and they want damages to boot.

In the lawsuit, Neeson points out he's won many acting awards, and been nominated more than 30 times including Oscar and Golden Globe nods for "Schindler's List." Cooper says he's been nominated too, and he's won some, including the ShoWest Convention Award for Comedy Star of the Year -- but not an Oscar.