Model 55 may refer to:
Aircraft Beech Model 55, a twin-piston-engine civil utility aircraft Curtiss Model 55 Kingbird, an airliner first flown in 1929 Learjet Model 55, a business jet
Firearms Model 55 Reising, a submachine gun produced by Harrington & Richardson Marlin Model 55, a series of large bolt-action shotguns SIG Model 55, the original designation for the SIG MG 710-3, a Swiss general-purpose machine gun Winchester Model 55, a lever-action repeating rifle produced from 1924 through 1932 that was a derivative of the Winchester Model 1894
Other Frankfort and Cincinnati Model 55 Rail Car, a railcar produced in 1927 IBM PS/2 Model 55 SX, a midrange member of the PS/2 family of personal computers IBM PS/2 Model 55 LS, a diskless workstation South Australian Railways Brill Model 55, a railcar introduced in 1924
See also M55 (disambiguation) Type 55 (disambiguation)