3A
3A , 3 A , 3-A or III A stands for:
- 3A (band) , German band
- Main camp III A , German main camp for prisoners of war
- Nationality mark for aircraft from Monaco
- British Columbia Highway 3A , Canadian Highway
- Nevada State Route 3A, now part of Nevada State Route 264 , US State Route
- Long March 3A , Chinese rocket
