Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Horse Prairie Creek | Stream | | Beaverhead | 44 58 30 N | 112 55 10 W |
| Horse Prairie Guard Station | Locale | 2081 | Beaverhead | 45 01 25 N | 113 19 19 W |
| Horse Prairie Post Office (historical) | Post Office | 2025 | Beaverhead | 44 53 55 N | 113 15 23 W |
| Horse Prairie School (historical) | School | 2025 | Beaverhead | 44 53 55 N | 113 15 23 W |
| Horse Ranch School (historical) | School | 1004 | Fergus | 47 23 50 N | 109 07 45 W |
| Horse Range Spring | Spring | 1083 | Powder River | 45 20 24 N | 106 04 39 W |
| Horse Reservoir | Reservoir | 839 | Prairie | 46 34 17 N | 104 57 12 W |
| Horse Ridge | Ridge | 1904 | Big Horn | 45 00 42 N | 107 44 02 W |
| Horse Ridge | Ridge | 1494 | Flathead | 47 57 10 N | 113 31 25 W |
| Horse Ridge Canyon | Valley | | Big Horn | 45 01 35 N | 107 43 16 W |
| Horse Ridge Canyon | Valley | 1523 | Big Horn | 45 01 35 N | 107 43 15 W |
| Horse Shoe Lake | Lake | 821 | Phillips | 48 50 09 N | 108 00 43 W |
| Horse Tied Creek | Stream | | Roosevelt | 48 07 27 N | 104 07 50 W |
| Horse Trough Dam | Dam | 765 | McCone | 47 42 42 N | 106 01 38 W |
| Horsecamp Coulee School (historical) | School | 799 | Phillips | 48 30 13 N | 107 50 46 W |
| Horsefly Creek | Stream | | Lewis and Clark | 46 59 60 N | 112 29 16 W |
| Horsefly Spring | Spring | 1825 | Meagher | 46 43 59 N | 110 53 31 W |
| Horsehead Peak | Summit | 2040 | Missoula | 47 10 16 N | 114 39 00 W |
| Horseman Creek | Stream | | Stillwater | 45 27 06 N | 109 50 19 W |
| Horseman Flats | Flat | 1849 | Stillwater | 45 25 45 N | 109 53 26 W |
| Horseman Flats Lake | Lake | 1668 | Stillwater | 45 24 59 N | 109 52 22 W |
| Horseshoe Basin | Basin | 831 | Daniels | 48 49 23 N | 105 55 58 W |
| Horseshoe Basin | Basin | 2816 | Gallatin | 45 22 45 N | 110 56 40 W |
| Horseshoe Basin | Basin | 2125 | Granite | 46 27 58 N | 113 06 49 W |
| Horseshoe Basin | Basin | 2801 | Park | 45 08 47 N | 110 05 16 W |
| Horseshoe Bend Mine | Mine | 2165 | Deer Lodge | 46 13 11 N | 113 12 30 W |
| Horseshoe Bend School (historical) | School | 691 | Petroleum | 47 20 38 N | 107 57 47 W |
| Horseshoe Coulee | Valley | | Phillips | 48 49 32 N | 108 10 31 W |
| Horseshoe Creek | Stream | | Gallatin | 45 58 25 N | 111 12 28 W |
| Horseshoe Creek | Stream | | Park | 45 09 58 N | 109 59 51 W |
| Horseshoe Hills | Range | 2034 | Gallatin | 46 01 25 N | 111 16 21 W |
| Horseshoe Lake | Lake | 2047 | Beaverhead | 45 01 24 N | 112 44 41 W |
| Horseshoe Lake | Lake | 1012 | Cascade | 47 30 53 N | 111 26 14 W |
| Horseshoe Lake | Lake | 945 | Lake | 48 01 11 N | 113 59 32 W |
| Horseshoe Lake | Lake | 1021 | Lincoln | 48 04 52 N | 115 10 11 W |
| Horseshoe Lake | Lake | 2816 | Park | 45 08 33 N | 110 05 28 W |
| Horseshoe Lake | Lake | 1914 | Park | 45 34 42 N | 110 17 12 W |
| Horseshoe Lake | Lake | 821 | Phillips | 48 50 07 N | 108 00 38 W |
| Horseshoe Lake | Lake | 724 | Roosevelt | 48 17 45 N | 105 13 60 W |
| Horseshoe Lake | Lake | 599 | Sheridan | 48 35 42 N | 104 02 43 W |
| Horseshoe Lake | Lake | 2902 | Sweet Grass | 45 16 11 N | 110 10 56 W |
| Horseshoe Lake - Ferndale Fishing Access Site | Locale | 945 | Lake | 48 01 07 N | 113 59 22 W |
| Horseshoe Lake School (historical) | School | 866 | Phillips | 48 51 30 N | 108 03 27 W |
| Horseshoe Mountain | Summit | 3047 | Park | 45 09 07 N | 110 05 11 W |
| Horseshoe Mountain Adit Mine | Mine | 45 | Park | 45 09 20 N | 110 05 11 W |
| Horseshoe Mountain Shaft | Mine | 2858 | Park | 45 08 38 N | 110 05 43 W |
| Horseshoe Peak | Summit | 2319 | Flathead | 48 04 33 N | 113 25 01 W |
| Horseshoe Spring | Spring | 1543 | Broadwater | 46 16 18 N | 111 41 30 W |
| Horseshoe/Nixon Glch Mine | Mine | 1523 | Gallatin | 45 56 40 N | 111 17 33 W |
| Horsetail Falls | Falls | 2557 | Park | 45 26 27 N | 110 54 59 W |
| Horsethief Canyon | Valley | | Fergus | 46 45 30 N | 109 11 30 W |
| Horsethief Coulee | Valley | | Fergus | 47 02 40 N | 109 05 06 W |
| Horsethief Creek | Stream | | Musselshell | 46 24 58 N | 108 35 23 W |
| Horsethief Mountain | Summit | 2121 | Gallatin | 46 01 59 N | 111 00 13 W |
| Horsethief Park | Flat | 2280 | Broadwater | 46 26 35 N | 111 46 40 W |
| Horsethief Park | Flat | 2265 | Jefferson | 46 24 60 N | 112 11 58 W |
| Horsethief Recreation Site | Locale | 1593 | Carbon | 45 14 23 N | 109 13 53 W |
| Horsethief Ridge | Summit | 1403 | Glacier | 48 47 10 N | 112 42 11 W |
| Horsethief Sportsman Access | Locale | 1605 | Carbon | 45 14 09 N | 109 13 43 W |
| Horsethief Spring | Spring | 2025 | Granite | 46 32 45 N | 113 26 17 W |
| Horsetrack Draw | Valley | | Carter | 45 37 34 N | 104 24 00 W |
| Horsford Spring | Spring | 723 | McCone | 47 50 21 N | 106 03 09 W |
| Horte Dam | Dam | 928 | Lake | 47 32 18 N | 114 16 09 W |
| Horte Reservoir | Reservoir | 926 | Lake | 47 32 17 N | 114 16 14 W |
| Horton | Locale | 733 | Custer | 46 20 30 N | 106 03 42 W |
| Horton | Populated Place | 734 | Custer | 46 20 29 N | 106 03 43 W |
| Horton Hollow | Valley | | Custer | 46 11 09 N | 106 08 00 W |
| Horton Post Office (historical) | Post Office | 733 | Custer | 46 20 35 N | 106 03 52 W |
| Horton Reservoir | Reservoir | 942 | Treasure | 46 16 21 N | 107 34 06 W |
| Hose Dam | Dam | 775 | Valley | 48 37 30 N | 106 53 50 W |
| Hosey (historical) | Populated Place | 1019 | Blaine | 47 51 35 N | 109 29 48 W |
| Hosey Post Office (historical) | Post Office | 1019 | Blaine | 47 51 35 N | 109 29 48 W |
| Hosford Camp | Locale | 1196 | Big Horn | 45 19 12 N | 106 49 21 W |
| Hoshow Coulee | Valley | | Big Horn | 45 53 01 N | 107 28 24 W |
| Hoskin Basin | Basin | 1013 | Yellowstone | 46 02 14 N | 108 30 04 W |
| Hoskin Basin Cemetery | Cemetery | 1075 | Yellowstone | 46 04 23 N | 108 32 48 W |
| Hoskins Lake | Lake | 1023 | Lincoln | 48 53 13 N | 115 38 13 W |
| Hospital Cemetery | Cemetery | 942 | Lake | 47 40 39 N | 114 09 44 W |
| Hot Bar Number 1 Dam | Dam | 691 | Dawson | 47 00 30 N | 104 30 20 W |
| Hot Springs | Populated Place | 866 | Sanders | 47 36 33 N | 114 40 07 W |
| Hot Springs | Spring | 1386 | Jefferson | 45 53 47 N | 112 13 56 W |
| Hot Springs | Spring | 1502 | Ravalli | 45 41 48 N | 114 21 52 W |
| Hot Springs (historical) | Locale | 1440 | Gallatin | 45 39 60 N | 111 11 03 W |
| Hot Springs (historical) | Locale | 1479 | Jefferson | 46 11 56 N | 112 05 45 W |
| Hot Springs Airport | Airport | 843 | Sanders | 47 36 44 N | 114 36 51 W |
| Hot Springs Bible Church | Church | 882 | Sanders | 47 36 25 N | 114 40 38 W |
| Hot Springs City Park | Park | 866 | Sanders | 47 36 30 N | 114 40 06 W |
| Hot Springs Convalescent Center | Hospital | 885 | Sanders | 47 36 38 N | 114 40 31 W |
| Hot Springs Creek | Stream | | Beaverhead | 45 27 00 N | 113 07 14 W |
| Hot Springs Creek | Stream | | Madison | 45 35 06 N | 111 35 42 W |
| Hot Springs Creek | Stream | | Meagher | 46 30 57 N | 110 57 07 W |
| Hot Springs Creek | Stream | | Sanders | 47 36 38 N | 114 33 03 W |
| Hot Springs Medical Clinic | Hospital | 867 | Sanders | 47 36 32 N | 114 40 18 W |
| Hot Springs Police Department | Building | 866 | Sanders | 47 36 33 N | 114 40 07 W |
| Hot Springs Post Office | Post Office | 867 | Sanders | 47 36 32 N | 114 40 08 W |
| Hot Springs Public Schools | School | 862 | Sanders | 47 36 30 N | 114 39 50 W |
| Hot Springs Substation | Locale | 872 | Sanders | 47 34 40 N | 114 37 40 W |
| Hot Springs Town-County Library | Building | 868 | Sanders | 47 36 30 N | 114 40 13 W |
| Hot Springs Volunteer Fire Department | Building | 866 | Sanders | 47 36 33 N | 114 40 07 W |
| Hotchkiss Post Office (historical) | Post Office | 787 | Custer | 46 10 55 N | 105 36 50 W |
| Hotel Broadwater (historical) | Locale | 1213 | Lewis and Clark | 46 36 13 N | 112 05 12 W |
| Hougan (historical) | Locale | 957 | Mineral | 47 22 60 N | 115 23 59 W |
| Hougan Number 5 Dam | Dam | 915 | Musselshell | 46 37 60 N | 108 05 44 W |
| Hougan Number 6 Dam | Dam | 919 | Musselshell | 46 37 18 N | 108 05 26 W |
| Hougan Number 7 Dam | Dam | 919 | Musselshell | 46 37 06 N | 108 04 38 W |
| Hough Dam | Dam | 820 | Fallon | 46 27 54 N | 104 47 44 W |
| Hough School (historical) | School | 842 | Petroleum | 47 01 58 N | 108 02 51 W |
| Houghlan Spring | Spring | 1148 | Powder River | 45 33 27 N | 105 53 22 W |
| Houghton Creek | Stream | | Lincoln | 48 01 36 N | 115 20 16 W |
| Houghton Park | Flat | 2165 | Jefferson | 45 58 57 N | 112 01 12 W |