Gareth Keenan is a fictional character on the BBC comedy The Office, played by Mackenzie Crook. He is obsessed with his past in the Territorial Army, and the fact that he is "team leader" even though this in reality gives him no power in the office.

A bearer of this name is the British footballer Gareth Southgate.

Welsh actor Gareth David-Lloyd, who plays Ianto on the British television series Torchwood.

Not-so famous bearer would be a small --very small-- character in Christopher Paolini's novel, Eragon. He is a bartender in a pub in the city of Teirm.

Gareth David-Lloyd, the actor who plays Ianto Jones. From Torchwood.

In the games "Fire Emblem: Path of Radiance" and "Fire Emblem: Radiant Dawn," the character Gareth was dour and heavily muscled red dragon.

Gareth Bryne, in Robert Jordan's Wheel of Time series. He is a major character, a wise general. Just an all around cool character.

Gareth is the name of an antagonist in the television series 'The Walking Dead'. He was the insane leader of the group of cannibals known as Terminus.
(Killed off far too quickly in my opinion).

Gareth Frank Bale is a Welsh professional footballer who plays as a winger for Spanish club Real Madrid and the Wales national team.