| Changmar | |
| Subdivision Type3: | County |
| Pushpin Label: | Changmar |
| Settlement Type: | Town |
| Pushpin Map: | China Qinghai |
| Pushpin Label Position: | bottom |
| Subdivision Type2: | Autonomous prefecture |
| Coordinates: | 35.8047°N 101.6089°W |
| Subdivision Type: | Country |
| Subdivision Name: | China |
| Subdivision Type1: | Province |
| Subdivision Name1: | Qinghai |
| Pushpin Map Caption: | Location in Qinghai |
| Subdivision Name2: | Hainan |
| Subdivision Name3: | Guide |
| Subdivision Type4: | Village-level divisions |
| Native Name: | Chinese: 常牧镇 · |
| Other Name: | Changmu |
| Unit Pref: | Metric |
| Area Total Km2: | 1232 |
| Population Total: | 16703 |
| Population As Of: | 2010 |
| Population Density Km2: | auto |
| Timezone1: | China Standard |
| Utc Offset1: | +8 |
| Postal Code Type: | Postal code |
| Postal Code: | 811701 |
| Area Code Type: | Local dialing code |
| Area Code: | 974 |
Changmar or Changmu is a town in Guide County, Hainan Tibetan Autonomous Prefecture, Qinghai, China. In 2010, Changmar had a total population of 16,703 people: 8,324 males and 8,379 females: 4,433 under 14 years old, 11,266 aged between 15 and 64 and 1,044 over 65 years old.[1]