‘Captain America’ Star Anthony Mackie Kisses Mystery Woman in London

Anthony Mackie was playing Captain Smooch on the streets of London — caught locking lips with a mystery woman who looked very pleased with her assignment!

TMZ got the pics — and let’s just say the “Captain America: Brave New World” star was in full smooth-operator mode in Notting Hill Tuesday … getting handsy and swapping spit in a steamy embrace with the blonde babe.

The PDA-packed makeout sesh was a two-person show — zero cares given. At one point, the Hollywood hunk even copped a smooth handful of her dress as they really went for it!

It’s unclear if this was a longtime fling or a flirty first-time spark — but either way, the chemistry was undeniable.

Clearly, Mackie’s soaking up his London downtime while filming the upcoming flick “Avengers: Doomsday.”