MR3 or MR-3 may refer to:
* ''
MegaRace 3
''MegaRace 3'' is a racing game, racing/vehicular combat video game developed by Cryo Interactive in 2002, released for Microsoft Windows, Windows and the PlayStation 2. ''MegaRace 3'' is the third game in the ''MegaRace'' series, after ''MegaRac ...
'', a 2002 video game
*
Mercury-Redstone 3, the first American human spaceflight
* ''
Monster Rancher 3
''Monster Rancher 3'' (known in Japan as ) is the third game in Tecmo's ''Monster Rancher'' series. It is the first game in the series for the PlayStation 2.
Gameplay
This game uses cel-shaded graphics to give the game a more cartoon-like feel. H ...
'', a 2001 video game
*
MR3 road, a major highway of Eswatini
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