There are at least six named mountains in Petroleum County, Montana.
- Dog Butte, 47°15′39″N 108°19′54″W / 47.26083°N 108.33167°W / 47.26083; -108.33167 (Dog Butte), el. 2,920 feet (890 m)[1]
- Dovetail Butte, 47°24′11″N 108°16′07″W / 47.40306°N 108.26861°W / 47.40306; -108.26861 (Dovetail Butte), el. 3,235 feet (986 m)[2]
- Duff Hill, 47°10′40″N 107°57′13″W / 47.17778°N 107.95361°W / 47.17778; -107.95361 (Duff Hill), el. 2,667 feet (813 m)[3]
- Rattlesnake Butte, 46°52′22″N 108°10′39″W / 46.87278°N 108.17750°W / 46.87278; -108.17750 (Rattlesnake Butte), el. 3,478 feet (1,060 m)[4]
- Three Buttes, 47°07′55″N 108°43′29″W / 47.13194°N 108.72472°W / 47.13194; -108.72472 (Three Buttes), el. 3,356 feet (1,023 m)[5]
- Tin Can Hill, 47°11′51″N 108°02′58″W / 47.19750°N 108.04944°W / 47.19750; -108.04944 (Tin Can Hill), el. 3,041 feet (927 m)[6]