T45
T45, T.45 or T-45 may refer to:

Vehicles 
 Cooper T45, a racing car
 McDonnell Douglas T-45 Goshawk, an American trainer aircraft
 SJ T45, a Swedish diesel-electric locomotive
 Slingsby T.45 Swallow, a British glider
 Type 45 destroyer, a destroyer class of the Royal Navy
 T45 Roadtrain, a 1988 Leyland Motors tractor truck

Other uses 
 T45 (classification), a disabled sports handicap class for arm amputees
 T.45 (standard), an ITU standard for run-length encoding