| Following are the lakes whose name begins with "O" which are included in the 1999 LAKEWATCH Report. Click on the lake name to go to the page containing information on that lake. |
| Lake | County |
| Oakland | Dade |
| Ochlockonee River | Leon |
| Odom | Volusia |
| Offspring | Volusia |
| Ola | Orange |
| Ola Little | Orange |
| Olivia | Highlands |
| Olivia | Orange |
| Olympia | Orange |
| Omega | Putnam |
| Opal | Clay |
| Orange | Alachua |
| Orienta 1 | Seminole |
| Orienta 2 | Seminole |
| Orienta East | Seminole |
| Orienta North | Seminole |
| Orlando | Orange |
| Osborne | Palm Beach |
| Osceola | Hillsborough |
| Otis | Polk |
| Otter | Polk |
| Overstreet | Leon |