Samuel Grimes was a politician in Queensland, Australia. He was a Member of the Queensland Legislative Assembly and represented the Electorate of Oxley from 3 December 1878 to 18 June 1902 when he died in office. He died of pneumonia after a short illness.
Samuel was born on 13 August 1837 at Ashby-de-a-Zouch, Leicestershire, England, and arrived in Queensland on the ship Chaseley in 1849. He was involved in farming in a number of areas around Moreton Bay from 1857 and was responsible for developing a sugar plantation on Hope Island in the Coomera River.
Grimes was sued for libel under an action taken by Thomas McIlwraith in May 1888. The suit involved words used in a speech made at the declaration of the poll at Oxley on 19 May when Grimes stated, amongst other things, "He might also mention that his opponent and his friends were extremely lavish of their money".