Gareth David Lloyd, known professionally as Gareth David-Lloyd, is a Welsh actor and writer best known for his role as Ianto Jones in the British science fiction series Torchwood.

Ianto Jones is a fictional character in the BBC television programme Torchwood, a spin-off from the long-running series Doctor Who, played by Welsh actor Gareth David-Lloyd. A regular within the show, Ianto appears in every episode of the programme's first three series excluding the finale of series 3, as well as two crossover episodes of Torchwood's parent show, Doctor Who. Additionally, Ianto appears in Expanded Universe material such as the Torchwood novels and audiobooks, comic books and radio plays. Within the narrative of the series, Ianto begins as general support officer for Torchwood Three, a team of alien hunters stationed in Cardiff, and develops into an active field agent. Initially the regular character with the least screen time, Ianto's role expanded in response to growing cult appeal.