MA3

MA3 or Ma3 or MA-3 may refer to:


 * Massachusetts Route 3
 * U.S. Route 3 in Massachusetts
 * The abbreviation for Massachusetts's 3rd congressional district
 * Ménage à 3 (webcomic), a webcomic published since 2008
 * HD Radio's all-digital AM modes
 * Mercury-Atlas 3, a test flight of Project Mercury