Ada Reis is an 1823 novel by the British writer Lady Caroline Lamb published in three volumes.^[1] It was her third novel and was published by John Murray. It was published six months after her previous work Graham Hamilton.^[2]

It didn't achieve the notoriety of her debut novel Glenarvon which contained a thinly-disguised portrait of her former lover Lord Byron, although the protagonist Ada Reis has some Byronic elements.^[3] Critical reception of the novel was mixed and Caroline's sister-in-law Emily described it as "a strange farrago".^[4]