PTU

PTU stands for

Police Tactical Unit, a special unit of the police in Hong Kong
Polskie Towarzystwo Ubezpieczeń, an insurance company in Poland
Power Transfer Unit, a system for transmitting power between two separate hydraulic systems
Powiat Turecki, a Polish city with License Plate PTU
Product and Technology Unit, part areas of SAP
PTU (film ) (2003 ), a film directed by Johnnie To
Punjab Technical University, Jalandhar, India
Propylthiouracil, a drug substance

PTU as distinguishing signs on license plate:

664318