| State: | ID |
| Route: | 33 |
| Type: | SH |
| Map Custom: | yes |
| Map Notes: | SH-33 highlighted in red |
| Length Mi: | 139.934 |
| Length Ref: | [1] |
| Terminus A: | near Arco |
| Direction A: | West |
| Junction: | |
| Terminus B: | at the Wyoming state line |
| Direction B: | East |
| Previous Type: | SH |
| Next Type: | SH |
| Previous Route: | 32 |
| Next Route: | 34 |
| Counties: | Butte, Jefferson, Madison, Fremont, Teton |
State Highway 33 (SH-33) is a state highway in eastern Idaho, spanning from U.S. Highway 20 (US 20) and US 26 to Wyoming Highway 22 (WYO 22) at the state line.
SH-33 begins at an intersection with US 20/US 26 in Butte County. It proceeds northwesterly, passing through rural area of the Idaho National Laboratory, before bending and traveling northward. The highway continues northward until intersecting with the Little Lost River Highway, and turning east. The road proceeds eastward, before intersecting SH-22.
After continuing eastward, the roadway bends northwest for a short distance, before bending back eastward. The route continues eastward, passing the Mud Lake Airport, and meeting SH-28. The roadway continues eastward, continuing through rural area, before reaching an interchange with Interstate 15 (I-15). The highway proceeds eastward, passing over the Henrys Fork, and continuing eastward.
The road enters Rexburg, reaching an interchange with US 20. The route continues eastward into Rexburg as Main Street before turning northward on 2nd East. The highway proceeds northward out of Rexburg, before bending northeast, traveling parallel to US 20, and the mileage posts reflect the mileage of the old US 20 routing. The roadway bends eastward, passing through Sugar City, before turning north. The route bends back eastward, restarting its mileage at exactly 100 miles, and proceeds to the community of Teton.
The highway continues east, passing through Newdale, and continuing through rural area. It continues, bending southeast, before bending northeastward, and afterward, bending back southeast. The highway travels east, intersecting SH-32, before turning south. The route passes the Driggs-Reed Memorial Airport and enters the city of Driggs. The road proceeds southward through Driggs, intersecting SH-31 in the community of Victor, and bending southeast. As the Teton Pass Highway, it continues to its eastern termination at the Wyoming state line, at an approximate elevation of above sea level.
WYO 22 continues eastward, climbing over Teton Pass at, then on to Jackson.