MR1 or MR-1 may refer to:
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Bristol M.R.1, an experimental biplane
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HAWAII MR1, a sea floor imaging system
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Major histocompatibility complex, class I-related
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Mercury-Redstone 1
Mercury-Redstone 1 (MR-1) was the first Mercury-Redstone uncrewed flight test in Project Mercury and the first attempt to launch a Mercury spacecraft with the Mercury-Redstone Launch Vehicle. Intended to be an uncrewed sub-orbital spaceflight, it ...
, an unsuccessful unmanned American space mission
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PNKD, or myofibrillogenesis regulator 1
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Shewanella oneidensis MR-1, a bacterium
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Hadoop architecture Map/Reduce version 1
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