Justin Bartha -- Unloads 'Hangover' Crash Pad

Justin Bartha will have to nurse any future hangovers somewhere else ... 'cause he just sold his Laurel Canyon crib, TMZ has learned.

Bartha bought the gated 1930s Spanish style home in 2007 for $1.25M ... and sold it this week for $1.385 -- slightly more than he was asking ... according to our real estate source's book of secrets.

Check it out ... the place is charming, but it's no palace -- just 1,416 sq ft with 2 bedrooms and 2 baths.