Tony the Tiger is the advertising cartoon mascot for Kellogg's Frosted Flakes (also known as Frosties) breakfast cereal, appearing on its packaging and advertising. More recently, Tony has also become the mascot for Tony's Cinnamon Krunchers and Tiger Power.

A recognizable and distinct voice was needed for the Tony the Tiger Character. Shortly after the initial Sugar Frosted Flakes advertisements aired, McKennon was replaced by Thurl Ravenscroft, who spent the next five decades providing the characteristic deep bass voice associated with the character, notably the familiar "They’re Grrrrreat!" catchphrase. John E Matthews came up with this phrase while working as copywriter for Leo Burnett. Ravenscroft continued to voice the character until his death in 2005.

Developed as part of a 1952 contest, Tony competed against three other potential mascots for the public's affection: Katy the Kangaroo (originated by Robert Dulaney in the early sixties), Elmo the Elephant, and Newt the Gnu. Within the year, the other mascots were dropped (with Elmo and Newt never once gracing the front of the box), and Tony was given a son, Tony Jr. Tony the Tiger later became a cereal icon.