Thomas Olliver (c. 1812 – 7 January 1874), born Oliver or Olivere, was a steeplechase jockey and racehorse trainer who won three Grand Nationals as a rider in the 1840s and 1850s.
Olliver was among the seventeen riders who participated in the first official running of the Grand National in 1839, finishing second on Seventy Four.
Olliver's last National was in 1858, after which time he retired from the saddle and became the landlord of 'The Star' public house in Leamington.
In the winter of 1873, he set about preparing his George Frederick for a crack at the 1874 Epsom Derby, but his health began to deteriorate and in January 1874 he died at the age of sixty-one.
Olliver's head lad continued the preparations of the horse, who won the richest prize in English racing that summer.