Fido

Fido may refer to:

Dogs

Fido Dido, a male (human) youth cartoon character created in 1985 and associated with the soft drink 7 Up since 1988
Fidough, a Pokémon species
Fido, a pet Brontosaurus in the 1939 animated film Daffy Duck and the Dinosaur
Fido, the pet dog sidekick in the 1916 animated film Bobby Bumps
Fido, a dog voiced by Mel Blanc in the 1949 animated film Woody Woodpecker and His Talent Show
Fido, a dog in the 1949 animated short film The House of Tomorrow
Fido, a pet flea in the 1999 animated film Olive, the Other Reindeer

Fido (band), a punk/rock band from Melbourne, Australia
Fido, one half of Alexis & Fido, a reggaeton duo
Fido, talking dog from the Frank Zappa song "Stinkfoot" on his 1973 album Over-Nite Sensation

Fairfield Industrial Dog Object, or Fido, a sculpture in Fairfield, Victoria, Australia

FIDO Alliance, an industry consortium working on internet authentication mechanisms, including the U2F protocol for two-factor authentication
Fido (wireless carrier), a Canadian cellular, home phone and Internet provider
FidoNet, a worldwide bulletin board system computer network, related to the FIDO bulletin board software package
A microcontroller version of the Freescale ColdFire (part of the Motorola 68000 series)
.fido a type of Cineon Graphics Data file format

Fido explosives detector, a portable "artificial nose" explosives detection device
Fire Direction Officer or FDO, the third ranking officer in a US artillery battery
Flight Dynamics Officer, a position in ground control of space missions
Fog Investigation and Dispersal Operation, a fog dispersal system developed in the Second World War
Mark 24 Mine or FIDO, a U.S. acoustic homing torpedo used during World War II
Roger Grosjean, an MI5 double agent (codename Fido) in World War II