Type 0

Type 0 or Type O may refer to:

Aircraft

 * Type 0 Carrier Fighter Mitsubishi A6M, a Japanese fighter aircraft
 * Type 0 Observation Seaplane Mitsubishi F1M, a Japanese reconnaissance seaplane
 * Type 0 Reconnaissance Seaplane Aichi E13A, a Japanese reconnaissance seaplane
 * Type 0 Small Reconnaissance Seaplane Yokosuka E14Y, a Japanese submarine-based reconnaissance seaplane
 * Type 0 Transport Showa/Nakajima L2D, a Japanese transport aircraft

Watercraft

 * Type-0 heavy lift vessel Dockwise Vanguard, a semi-submersible heavy lift ship

Media

 * Final Fantasy Type-0, a video game

Science

 * Glycogen storage disease type 0, a disease
 * Type 0 civilization in the Kardashev scale of technological advancement
 * Type-0 language or Recursively enumerable language in the Chomsky hierarchy of formal languages
 * Type 0 string theory, a model of string theory

Type O

 * Type O in the ABO blood group system
 * an O-type star
 * an O-type main-sequence star
 * an O-type giant star
 * a subdwarf O star
 * the Handley Page Type O, a biplane
 * an O-type asteroid