Brown snake may refer to:

• species of the genus Pseudonaja, highly venomous snakes native to Australia
• species of the genus Rhadinaea, the graceful brown snakes, snakes endemic to North America and Central America
• species of the genus Rhadinella, the graceful brown snakes, snakes endemic to North America and Central America
• the genus Sordellina, a monotypic genus with its sole representative, the dotted brown snake, Sordellina punctata
• species of the genus Storeria, snakes endemic to North America and Central America
• King brown snake (Pseudechis australis), a highly venomous snake of the family Elapidae