Creator
- Olsen, Dale A. (Dale Alan)1
- Olsen, Jean Crosby1
- Olson, Oscar, 1921-1
- Omni Associates1
- Onivas, D.2
- Orlando Gay Chorus1
- Orlando Modern Quilt Guild 1
- Orlando Shakespeare Theater1
- Orlando Sisters of Perpetual Indulgence1
- Orsley, Burnie H.1
- Orsley, Hazel Armwood , -20081
- Osborn, Virginia, Dr.1
- Oscar, Marie, 1917-20041
- Osgood, George E.1
- Osser, Glen4
- Osterweil, John W.1
- Otto Berndt & Son (Chicago, Illinois)1
- Otto L. Bettmann1
- Oxman, Thomas, 1915-20141
- Oyler, Dave (1946-2018)27