WHA players whose last name begins with letter O
| Name | Pos | Birthdate | Birth City | Country | GP | G | A | P | PIM | |
|---|---|---|---|---|---|---|---|---|---|---|
 | O'Connell, Tim | F | 10/26/1953 | Chicago, Illinois | United States | 16 | 0 | 3 | 3 | 4 |
 | O'Donnell, Fred | F | 12/06/1949 | Kingston, Ontario | Canada | 155 | 32 | 26 | 58 | 165 |
| O'Donoghue, Don | F | 08/27/1949 | Kingston, Ontario | Canada | 147 | 25 | 37 | 62 | 63 |
| O'Neil, Paul | F | 08/24/1953 | Charlestown, Massachusetts | United States | 1 | 0 | 0 | 0 | 0 |
| O'Shea, Danny | F | 06/15/1945 | Toronto, Ontario | Canada | 76 | 16 | 25 | 41 | 47 |
| O'Shea, Kevin | F | 05/28/1947 | Toronto, Ontario | Canada | 68 | 10 | 10 | 20 | 42 |
| Odrowski, Gerry | D | 10/04/1938 | Trout Creek, Ontario | Canada | 282 | 16 | 114 | 130 | 230 |
| Olds, Walter | D | 08/17/1949 | Warroad, Minnesota | United States | 89 | 5 | 12 | 17 | 10 |
| Orr, Bill | D | 06/12/1948 | South Porcupine, Ontario | Canada | 46 | 3 | 9 | 12 | 16 |
| Ouimet, Francois | D | 10/14/1951 | Montréal, Quebec | Canada | 25 | 1 | 10 | 11 | 12 |
| Ouimet, Ted | G | 07/06/1947 | Rouyn-Noranda, Quebec | Canada | 1 | 0 | 0 | 0 | 0 |