how many lethal weapon movies are there

There are four Lethal Weapon feature films released between 1987 and 1998. Additionally, there was a television series adaptation that ran from 2016 to 2019, but it is separate from the film count. So, if you’re asking strictly about movies, the answer is four. If you’re including the TV series as part of the franchise, the broader franchise footprint includes four films plus the TV series.