Mega Man Battle Network 3, known as Battle Network Rockman EXE3 (バトルネットワーク ロックマンエグゼ３ Batoru Nettowāku Rokkuman Eguze Surī) or Rockman EXE 3 in Japan, is the third mainline game in the Mega Man Battle Network series released for the Nintendo Game Boy Advance in two versions: White and Blue. The game follows Lan Hikari and his NetNavi MegaMan.EXE as they battle the second incarnation of the WWW. A sequel, Mega Man Battle Network 4, was released the following year.

In Japan, White version is simply called Battle Network Rockman EXE 3 or Rockman EXE 3 with no version title. Meanwhile Blue version is called Battle Network Rockman EXE3 BLACK, or Rockman EXE 3 BLACK. The Japanese version had White releasing by itself first with Blue coming out months later. Despite that, Blue contains the same bugs White had.

Battle Network 3 is the first game in the series to come in two versions. Like later alternate versions, it replaced and introduced exclusive Battle Chips, chip codes, a boss, a form change, and a number of cosmetic changes. Unlike later games however, the in-game shop stock greatly differs, the preset story virus battle setups are changed, there are exclusive Navi Customizer parts, and contains one new boss that doesn’t replace a Navi from the original. All future mainline Battle Network games released in two versions from this point on.

Story elements from Battle Network 3 were loosely adapted for the First Area of the first season of the MegaMan NT Warrior anime series; namely the N1 Grand Prix, while characters from the game were used in later seasons.