The Allison T38 (company Model 501) was an early large turboprop engine developed by Allison Engine Company during the late 1940s.
The Northrop T-38 Talon is a two-seat, twinjet supersonic jet trainer.
The Slingsby T.38 Grasshopper is a British primary training glider built by Slingsby Sailplanes for the Royal Air Force.
The T-38 amphibious scout tank was a Soviet amphibious light tank that saw service in World War II.
T.38 is an ITU recommendation for allowing transmission of fax over IP networks in real time.
T38 and CP8 are disability sport classification for disability athletics intended for people with cerebral palsy.