T4

T4 or T-4 may refer to:

In airports and airlines

• The IATA airline code for Hellas Jet
• Madrid Barajas Airport Terminal 4
• London Heathrow Airport Terminal 4

In biology and medicine

• T4 phage, a bacteriophage
• Thyroxine (T₄), a form of thyroid hormones
• The T4 spinal nerve
• Fourth thoracic vertebrae of the vertebral column
• A non-small cell lung carcinoma staging for a type of tumour

In entertainment

• T4 (Channel 4), the weekend morning teen-aimed slot on Channel 4 in UK
• Terminator Salvation, sometimes referred to as Terminator 4

In software and video games

• Text Template Transformation Toolkit, a technology developed by Microsoft
• Tekken 4, fighting game

Vehicles

• Kawasaki T-4, a Japanese aircraft
• Sukhoi T-4, a Soviet aircraft
• Tatra T4, a 1967 Czechoslovakian tram
• Volkswagen Transporter series IV van
• A model of the OS T1000 train of the Oslo Metro

Weapons and explosives

• T-4 Atomic Demolition Munition, a small tactical nuclear bomb
• G7e/T4, a Falke German torpedo
• The Italian name for the high explosive RDX

Other

• A T4 slip, a tax return form used in income taxes in Canada
• Action T4, a Nazi Germany "euthanasia" program
• Normal space in topology
• Paris Tramway Line 4
• Traveller (role-playing game), version 4