The TMZ staff turned the year's biggest headlines into Halloween costumes ... with everything from the Johnny Depp and Amber Heard divorce to Blac Chyna and Rob Kardashian's hookup making a showing in the office.

But the award for best in show goes to Kim Kardashian handcuffed in a bathtub with the least tough gang of French burglars. Too soon?

There's even a UFC showdown -- Ronda Rousey, Cyborg and Conor McGregor were repped.

Tune in Monday night to "TMZ on TV" to see all the costumes in action!