MR1

MR1 or MR-1 may refer to:

• Bristol M.R.1, an experimental biplane
• HAWAII MR1, a sea floor imaging system
• Major histocompatibility complex, class I-related
• Mercury-Redstone 1, an unsuccessful unmanned American space mission
• PNKD, or myofibrillogenesis regulator 1
• Shewanella oneidensis MR-1, a bacterium
• Hadoop architecture Map/Reduce version 1