M31
M31或M-31、M31可以指：
- 仙女座星系，梅西耶31，一个梅西耶天体
- M31 = 0x7FFFFFFF = 2147483647
- 索米M1931冲锋枪，索米M/31
- M31反坦克槍榴彈
- 三星Galaxy M31
- 休姆高速公路，澳大利亚"M31"国道
| L31 | ||
| M30 | M31 | M32 |
| N31 | ||
| M31 | - | 31M |
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