Pokémon Blue Version (Japanese: ポケットモンスター　青 Pocket Monsters: Blue) is the third core series Pokémon game for Game Boy.

This game was announced on October 15, 1996, at the cover-dated November 1996 issue of CoroCoro Comic. The game was originally released by mail in early December 1996 to those who have requested it using an application form from this CoroCoro issue.

The game was originally released to celebrate 1 million sales of Pokémon Red and Green. It was later re-released (again as mail order) in 1997 to celebrate 4 million sales of Red, Green, and Blue combined, and then was ultimately released to general retail on October 10, 1999.

In Japan, Pokémon Blue is a minor revision of Pokémon Red and Green, which were released earlier in the same year. It was thus the first solitary version in the core series Pokémon games. Various fixes in the game include a graphics and sound upgrade, as well as the removal of several known glitches that had been found in the original pair. Outside of Japan, the pair of games Pokémon Red and Blue was released with the same wild Pokémon and Version-exclusive Pokémon lists as Japanese Red and Green, with the graphics and game engine from Japanese Blue.

The game is available on the Nintendo 3DS Virtual Console in Japan between the Pokémon 20th Anniversary on February 27, 2016, and the discontinuation of the 3DS Nintendo eShop in March 2023.