Johnny Manziel's War Over Party Mansion Rent Lawsuit

We told you it was coming ... and now it's official -- Johnny Manziel has been formally sued for not paying rent on a $25,000 per month party pad in the Hollywood Hills.

However, Manziel says he's being unfairly targeted and has done NOTHING wrong.

TMZ Sports broke the story ... the guy who owns the legendary Weidlake mansion (used in tons of TV shows) served Manziel and his friends with an eviction notice last week -- claiming the QB missed a rent payment and had badly damaged the property.

Manziel had claimed he never rented the home and the allegations were bogus -- but in his suit, the owner included a copy of the original lease which includes Manziel's name listed as a person who would be residing in the home.

In his suit, filed in L.A. County Superior Court, Fitzgerald claims Manziel and his two friends are all on the hook for more than $25k for rent and other fees.

We reached out to Fitzgerald who says he's planning to file a separate lawsuit for the damages -- which could go into the 6 figure range.

We reached back out to Manziel who says he did occasionally stay at the home -- but NEVER signed any agreement that would put him on the hook for the rent.