O
- W. A. O.
- Mikiko O’Bannon
- Geoffrey O’Hara
- Eleanor O’Kelley
- D. J. O’Malley
- P. J. O’Reilly
- Daphne O’Rullian
- Dan O’Very
- Grayson O’Very
- Frederick Oakeley
- Rock E. Oakeson
- Emily S. Oakey
- Arthur A. Oakman
- Roy D. A. Oakman
- Anna Morgan Oaks
- Johnson Oatman Jr.
- Barbara Boyer Obray
- Adam Oehlenschläger
- Of Precious Value
- Jacques Offenbach
- Ogden Institute of Religion Combined Choruses
- John Ogilvie
- Louise M. Oglevee
- William G. Oglevee
- Jonatan Oguey
- Dorothy Ohl
- Ferris Ohl
- Michael Babatunda Olantunji
- Maggie Olauson
- Ammon Olayan
- Liahona Olayan
- Thomas Oliphant
- Thomas Olivers
- Carl J. Olsen
- H. P. Olsen
- James P. Olsen
- Rita Mae Olsen
- Ernst W. Olson
- Julia D. Olson
- Kevin R. Olson
- Richard John Olson
- Taylor Olson
- Omer
- Henry U. Onderdonk
- One Clear Voice
- Richard L. Openshaw
- Chris Oram
- Coby Oram
- Orchestra at Temple Square
- LaVonne Van Orden
- Preston Ware Orem
- Tyra Orgill
- Meta Orred
- Daniela Ortega
- Rodrigo Ortiz
- Elizabeth Osborn
- Oskar and Julia
- David Osmond
- Jessi Osmond
- Lana Osmun
- Tamara Oswald
- C. E. Ott
- Jerold D. Ottley
- Sidney J. Ottley
- Joan Oviatt
- Ken Owen
- John Oxenford
- Maurine Benson Ozment