Killer Mike is suing over last year’s arrest at the Grammys … and he’s laying the blame on the private security services hired to work the event.

In a new lawsuit, obtained by TMZ, the rapper says he was stopped by security on his way to the red carpet for photos and media interviews despite winning a bunch of awards and having all the necessary credentials to access the secured area.

Killer Mike says the two companies the Grammys hired to do security at the 2024 show — S&S Labor Force Inc. and JRM Private Security — gave their employees way too much power … which led to him being unlawfully placed under citizen’s arrest.

In the docs, Mike says he was unlawfully detained when security put him under citizen’s arrest under false pretenses … and he says it led to cops eventually arresting him and holding him in a nearby jail for hours, causing him to miss out on presenting a Grammy award for a huge TV audience.

As we reported, Killer Mike was ultimately released from police custody after the award show … and a couple months later, prosecutors declined to pursue criminal charges against him.

Mike says the whole saga caused him unnecessary public embarrassment, distress and professional harm … and he’s going after the security companies for damages.