Gerry O'Riordan — credited at least once as Gerry O Riordan — was an orchestral recording engineer for Doctor Who, who worked on the following stories:
- The Almost People
- Amy's Choice
- Before the Flood
- The Bells of Saint John
- The Big Bang
- The Caretaker
- A Christmas Carol
- Closing Time
- Cold War
- The Curse of the Black Spot
- Dark Water
- The Day of the Doctor
- Day of the Moon
- Death in Heaven
- Deep Breath
- Dinosaurs on a Spaceship
- The Doctor Falls
- The Doctor's Wife
- The Doctor, the Widow and the Wardrobe
- The Eaters of Light
- Empress of Mars
- The End of Time
- Extremis
- Face the Raven
- Flatline
- The Girl Who Died
- The Girl Who Waited
- The God Complex
- A Good Man Goes to War
- Heaven Sent
- Hell Bent
- Hide
- The Hungry Earth
- The Husbands of River Song
- The Impossible Astronaut
- In the Forest of the Night
- Into the Dalek
- Journey to the Centre of the TARDIS
- Kill the Moon
- Knock Knock
- Last Christmas
- Let's Kill Hitler
- The Lie of the Land
- Listen
- The Lodger
- The Magician's Apprentice
- Mummy on the Orient Express
- The Name of the Doctor
- Night Terrors
- Nightmare in Silver
- Oxygen
- The Pandorica Opens
- The Pilot
- The Power of Three
- The Pyramid at the End of the World
- The Rebel Flesh
- The Return of Doctor Mysterio
- Robot of Sherwood
- Sleep No More
- Smile
- Thin Ice
- Time Heist
- The Time of the Doctor
- A Town Called Mercy
- Twice Upon a Time
- Under the Lake
- The Wedding of River Song
- The Witch's Familiar
- The Woman Who Lived
- World Enough and Time
- The Zygon Invasion
- The Zygon Inversion
In 2016, he recorded the Big Finish Torchwood audio story Ghost Mission.