The Silurian is the geological period and system lasting roughly from 445 million years ago to 415 million years ago.
Silurian may also refer to:
Silurian, the society, culture, language, and ethnicity of the Silures, an ancient Welsh tribe
Silurian, the racehorse that won the 1923 Doncaster Cup
Silurian Press Club, the society established at 1924 by a group of maverick Park Row newspaper veterans
Silurian (Doctor Who), a fictional race of humanoid reptiles who existed before humanity
Silurian hypothesis, a thought experiment that speculates if a prior advanced civilization on Earth would leave behind present day evidence of its existence
Silurian Hills, a small range of hills in the Mojave Desert