Thomas Vicars (1589 – 1638) was a 17th-century English theologian and rhetorician.
He was born in Carlisle in Cumberland (now Cumbria), the son of William and Eve Vicars.
He entered Queen's College, Oxford in 1607 as a poor serving child.
Recognised as a learned theologian, he entered the household of George Carleton, the Bishop of Chichester, whose step-daughter, Anne, the daughter of the sometime Ambassador to France, Henry Neville of Billingbear House in Berkshire, he married.
Carleton made him Vicar of Cuckfield in West Sussex.