| Index | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Naval Air |
| O |
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| HMCS OJIBWA | HMCS OKANAGAN | HMCS ONONDAGA |
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| HMCS ONTARIO | HMCS ORIOLE | HMCS OSHAWA |
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| HMCS OTTAWA | HMCS OUTREMONT |