M45 or M-45 may refer to:

In science:

  • Messier 45, an open star cluster also known as the Pleiades
  • 45th known Mersenne prime
  • M45 genetic marker, a genetic marker on the Y-chromosome
  • Yahoo M45, a supercomputing cluster

In transportation:

  • Infiniti M45, a luxury car
  • M45 motorway, a motorway in England
  • M-45 (Michigan highway), a state highway in Michigan
  • M-45, a motorway in Spain

In firearms and military equipment:

  • Carl Gustav M/45, a Swedish submachine gun
  • M45 SLBM, a French submarine-launched ballistic missile
  • M45 Quadmount, a weapon platform with four M2 Browning machine guns
  • MEU(SOC) pistol, the standard-issue side arm for the Force Recon Element of the United States Marine Corps' Marine Expeditionary Units.
  • A variant of the M26 Pershing medium tank, initially named T26E2.


Space Pleiades M45 Open Cluster Night Stars Collab

Based on and inspired by Shelly's Night Is When the Stars Shine, itself based on Sasha's Night of ...

"As a professor of science, I assure you we did, in fact, evolve from filthy monkey-men."
Professor Farnsworth
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