Sarah Siddons (1755–1831) was a Welsh-born stage actress, the best-known tragedienne of the 18th century.
Sarah Siddons may also refer to:
Sarah Siddons (horse), a racehorse Sarah Siddons (locomotive), an electric locomotive on the London Underground from 1923 to 1962 Sarah Siddons as the Tragic Muse, a 1784 painting by Joshua Reynolds
See also Sarah Siddons Award Sarah Siddons Society