Kobe Bryant -- BALLER MOVIE NIGHT ... Buys Entire Section of Theater In Costa Rica

Kobe Bryant wanted to make sure he could stretch all the way out during a screening of the movie "Inside Out" this week -- so he bought out an ENTIRE section of the theater ... TMZ Sports has learned.

Bryant is currently on vacation in Costa Rica -- and took his wife and daughters to the Beach Cinema Hermosa to catch a flick Wednesday evening.

We spoke with one of the owners of the theater who tells us ... Bryant bought out a "good amount of the theater" so his family could have privacy during the movie.

We're told everyone at the theater was respectful -- and Kobe was "extremely nice."