Last Names Beginning With O
- Steve O
- Dara O'Briain
- Conan O'Brien
- Dylan O'Brien
- Kieran O'Brien
- Peter O'Brien
- Richard O'Brien
- Tina O'Brien
- Charlie O'Connell
- Jack O'Connell
- Jerry O'Connell
- Frances O'Connor
- Renee O'Connor
- Sinead O'Connor
- Hugh O'Conor
- Aubrey O'Day
- Jennifer O'Dell
- Nancy O'Dell
- Chris O'Donnell
- Rosie O'Donnell
- Colin O'Donoghue
- Danny O'Donoghue
- Chris O'Dowd
- Conor O'Farrell
- Gail O'Grady
- Lani O'Grady
- Paul O'Grady
- Jack O'Halloran
- Catherine O'Hara
- David O'Hara
- Maureen O'Hara
- Michael O'Hare
- John O'Hurley
- Dermot O'Leary
- Alex O'Loughlin
- Daragh O'Malley
- Mike O'Malley
- Jason O'Mara
- Kate O'Mara
- Patrice O'Neal
- Ryan O'Neal
- Shaquille O'Neal
- Tatum O'Neal
- Ed O'Neill
- Terry O'Quinn
- Ahna O'Reilly
- Bill O'Reilly
- Robert O'Reilly
- Dolores O'Riordan
- Ronnie O'Sullivan
- Annette O'Toole
- Peter O'Toole
- Gemma Oaten
- John Oates
- Warren Oates
- Barack Obama
- Merle Oberon
- Jacqueline Obradors
- Bill Oddie
- Tom Odell
- Bob Odenkirk
- Devon Odessa
- Nick Offerman
- Ian Ogilvy
- Sandra Oh
- Masi Oka
- Tao Okamoto
- Dayo Okeniyi
- Sophie Okonedo
- Antonia Okonma
- Keith Olbermann
- Gary Oldman
- Lena Olin
- Jason Olive
- Ingrid Oliver
- John Oliver
- Dawn Olivieri
- America Olivo
- Bodie Olmos
- Ashley Olsen
- Elizabeth Olsen
- Merlin Olsen
- Susan Olsen
- Bree Olson
- Kaitlin Olson
- Renee Olstead
- Timothy Olyphant
- Jerry Only
- Deobia Oparei
- Rita Ora
- Jerry Orbach
- Roy Orbison
- Lisa Origlasso
- Stacey Oristano
- Julia Ormond
- Leland Orser
- Ana Ortiz
- Shalim Ortiz
- Valery Ortiz
- Beth Orton
- Randy Orton
- Phina Oruche
- Meghan Ory
- Dan Osborne
- Kelly Osbourne
- Ozzy Osbourne
- Sharon Osbourne
- Emily Osment
- Donny Osmond
- Marie Osmond
- Patton Oswalt
- Cheri Oteri
- Carre Otis
- Gotz Otto
- Gracie Otto
- Miranda Otto
- Maryse Ouellet
- Tamzin Outhwaite
- Clive Owen
- Kai Owen
- Mark Owen
- Michael Owen
- Chris Owens
- Terrell Owens
- David Oyelowo
- Frank Oz
- David Ogden Stiers
- Sven Ole Thorsen
Choose A Celebrity
Tallest And Shortest
Our tallest celebrity is Robert Wadlow who stood at a massive 8 feet 11 inches. Our shortest is Verne Troyer. Guess how tall he was!