| Lake | County | Latitude | Longitude |
| O Brien Lake | Dakota | 44.780827 | -93.141834 |
| O Conners Lake | Washington | 44.830075 | -92.788002 |
| O Donnell Lake | Itasca | 47.649908 | -93.394906 |
| O Dowd Lake | Scott | 44.741389 | -93.516780 |
| O Leary Lake | Itasca | 47.578013 | -93.187554 |
| O Mera Lake | McLeod | 44.967324 | -94.333130 |
| O Reilly Lake | Itasca | 47.362143 | -93.429446 |
| O-Me-Mee Lake | Becker | 47.032459 | -95.864202 |
| Oak Glen Lake | Steele | 43.929485 | -93.073933 |
| Oak Narrows | St. Louis | 47.909697 | -92.460374 |
| Oakleaf Lake | Nicollet | 44.306997 | -94.015928 |
| Oaks Lake | Cottonwood | 43.927992 | -95.433413 |
| Oberg Lake | Cook | 47.632680 | -90.777713 |
| Ocheda Lake | Nobles | 43.569197 | -95.592975 |
| Ochotto Lake | Stearns | 45.620337 | -94.448040 |
| Oconner Lake | Cass | 46.920235 | -94.028053 |
| Octopus Lake | Cook | 47.985551 | -90.845994 |
| Odeima Lake | Lake | 47.642610 | -91.320072 |
| Ododikossi Lake | Cass | 47.040137 | -94.002369 |
| Odonald Lake | Morrison | 45.888017 | -94.506766 |
| Ogechie Lake | Mille Lacs | 46.144287 | -93.771539 |
| Ogema Lake | Becker | 47.140577 | -95.866870 |
| Ogishkemuncie Lake | Lake | 48.098971 | -91.065125 |
| Ogle Lake | Cook | 48.032998 | -90.900573 |
| Ogren Lake | Chisago | 45.365323 | -92.792898 |
| Ohlsrud Lake | Grant | 45.798241 | -96.049967 |
| Ohmans Lake | Dakota | 44.816166 | -93.067665 |
| Okabena Lake | Nobles | 43.614093 | -95.617508 |
| Oketo Lake | Cook | 47.942830 | -90.975905 |
| Olander Lake | Crow Wing | 46.456097 | -93.938984 |
| Old Squaw Lake | St. Louis | 48.101670 | -91.914572 |
| Olds Lake | Aitkin | 46.845393 | -93.752986 |
| Ole Lake | St. Louis | 47.975235 | -92.029717 |
| Olio Lake | Cook | 47.963086 | -90.829775 |
| Omaday Lake | Lake | 47.818764 | -91.645232 |
| Omega Lake | Cook | 48.008620 | -90.644479 |
| Omen Lake | Cass | 46.555696 | -94.515737 |
| Omsrud Lake | Brown | 44.141770 | -94.546712 |
| Onagon Lake | Cook | 48.160624 | -90.876322 |
| One Acre Lake | Becker | 46.994267 | -95.202414 |
| One Hundred Acre Slo | Watonwan | 43.999483 | -94.600045 |
| One Island Lake | Cook | 48.050673 | -90.588889 |
| One Lake | Clearwater | 47.756936 | -95.460416 |
| One Loaf Lake | Itasca | 47.589808 | -94.156849 |
| One Mile Lake | Otter Tail | 46.277773 | -96.050795 |
| One Pine Lake | St. Louis | 47.810583 | -91.875506 |
| One Toe Lake | Cook | 47.948740 | -90.888157 |
| Oneka Lake | Washington | 45.178880 | -92.968195 |
| Onstad Lake | Otter Tail | 46.299165 | -95.871553 |
| Oppegaard Lake | Polk | 47.645302 | -95.929038 |
| Opperman Lake | Otter Tail | 46.299305 | -96.061897 |
| Orchard Lake | Dakota | 44.700374 | -93.308946 |
| Orchid Lake | Lake | 47.773309 | -91.209973 |
| Oreland Lake | Crow Wing | 46.431054 | -93.921015 |
| Organ Lake | Lake | 47.748209 | -91.035160 |
| Oriniack Lake | St. Louis | 48.005518 | -92.345296 |
| Oriole Lake | Cook | 47.912815 | -90.925626 |
| Oronu Lake | Sherburne | 45.309032 | -93.603678 |
| Ortman Lake | Morrison | 46.036106 | -94.064313 |
| Orwell Lake | Otter Tail | 46.206846 | -96.152555 |
| Osier Lake | Lake | 47.557140 | -91.393975 |
| Osprey Lake | Cook | 47.904247 | -90.470287 |
| Osterberg Lake | Pope | 45.727241 | -95.717712 |
| Otrey Lake | Big Stone | 45.357942 | -96.336102 |
| Ott Lake | Cook | 47.983488 | -90.605085 |
| Ottertail Lake | Otter Tail | 46.396270 | -95.670333 |
| Otto Lake | Becker | 47.206099 | -93.942836 |
| Otto Lakes | Cook | 48.001931 | -90.608581 |
| Ouff Lake | Polk | 47.594828 | -95.783107 |
| Outlaw Lake | Lake | 47.698929 | -91.093220 |
| Ova Lake | Lake | 47.698238 | -91.472895 |
| Over Look Lake | Hennepin | 44.796664 | -93.339025 |
| Overby Lake | Polk | 47.647575 | -95.749067 |
| Overlook Lake | Morrison | 46.172459 | -94.522403 |
| Owen Lake | Itasca | 47.679306 | -93.384379 |
| Owlheet Lake | St. Louis | 47.859020 | -91.951398 |
| Ox Camp Lake | Cass | 46.830724 | -94.576048 |
| Ox Lake | Crow Wing | 46.713268 | -94.116089 |
| Oxboro Lake | Hennepin | 44.833964 | -93.282973 |
| Oxbox Lake | Cass | 46.878638 | -93.904910 |
| Oxhide Lake | Itasca | 47.341614 | -93.211337 |
| Oyster Lake | St. Louis | 48.225808 | -92.107257 |
| Ozada Lake | Cook | 47.924848 | -90.527721 |