Monida Pass is a high mountain pass in the northern Rocky Mountains of the western United States, at an elevation of 6,870 feet (2,094 m) above sea level on Interstate 15, and 6,820 feet (2,079 m) on the Union Pacific Railroad.

[1] The pass forms part of the border between eastern Idaho and southwestern Montana, and is between the towns of Spencer in Clark County and Lima in Beaverhead County.

[2] Union Pacific once had an icemaking plant at Humphrey, Idaho, which is now a ghost town; Monida, Montana, which is near the top of the pass, is also almost a ghost town, as only seven people now live there at 6,780 feet (2,067 m), ninety feet (27 m) below the pass on I-15.

In the late 19th century, stagecoaches ferried tourists from the railroad at Monida Pass to Yellowstone National Park, until UP built a branch line to the park over Reas Pass.

Interstate 15, the "Veterans Memorial Highway," runs through the pass and north to the international boundary with Canada at Sweetgrass.