Yeah but you gotta look past some historical inaccuracies and just outright fabrications in Death of Stalin.
I probably don't need to tell you, but the entire Coen brothers oeuvre is pretty great. Burn After Reading and Fargo in particular are some of their darker comedies.
Underground
Follows two partisans from WWII to the Yugoslav wars of the nineties. There's literal tankies in this film.
Parasite, Bad Santa, Fargo, In The Loop, American Psycho, Grand Budapest Hotel, Thankyou for Smoking, Life of Brian, Office Space, Shaun of the Dead, What we do in the Shadows
Also +1 to all the suggestions here
You looking for so-bad-its-good, comedy-horror, or an wry smile at oblivion?
"Tucker and Dale VS Evil" is one of my favorite movies, kinda dark in subject matter with some gore, but in a comedic way.
realising im not really sure what constitutes 'dark' humor, theres a lotta funny movies that feature or center violence and death
snatch, heathers, dr strangelove
then theres funny horror movies which can be on purpose or not
the driller killer, toxic avenger, suspiria, tales from the hood, re-animator, return of the living dead