David OReilly (born 1985) is an Irish artist, film maker and game developer based in Los Angeles, California, United States.

In 2007, he produced the surreal short film "RGB XYZ" which tells the story of a young man kicked out of his parents' house to work in the big city, while using low poly graphics, compression artefacts, text to speech voices, jarring colour palettes, and discordant tones.

On 13 March 2008, a YouTube user named RANDYPETERS1, a 9-year-old boy from Chicago, submitted a hand-drawn animated video about Octocat, a red cat head with eight long legs looking for his parents.

On 7 September, the fifth, final episode was released, but featured an unexpected twist – at about 25 seconds in, the crude sketchy animation switched to intricately crafted 3D with an orchestral soundtrack; the whole Octocat story (and as such, the Randy Peters persona) was revealed to be by David OReilly.

[8] David announced his first game Mountain at MOCA Los Angeles in June 2014,[9] and released it the following month in partnership with Double Fine Productions for personal computers and mobile devices.