Thomas Lucas (c.1720–1784) was a British MP and West India merchant.

Thomas Lucas may also refer to:

• Thomas Lucas (MP for Midhurst), MP for Midhurst in 1407
• Thomas Lucas (MP for Southwark), MP for Southwark in 1421
• Thomas Lucas (16th century MP), Member of Parliament for Colchester
• Thomas Lucas (Royalist) (died 1649), officer fighting for the royalist cause in the English Civil War
• Thomas Lucas (educator) (c. 1764–1838), founder of the Royal London Society for Blind People and developer of the Lucas tactile alphabet system
• Thomas Lucas (1822–1902), first baronet of the Lucas baronets
• Thomas Pennington Lucas (1843–1917), Scottish-born Australian medical practitioner, naturalist, author, philosopher and utopianist
• Thomas Geoffry Lucas (1872–1947), English architect
• Thomas John Lucas (1826–1908), Union general in the American Civil War
• Tommy Lucas (1895–1953), England footballer
• Tom Lucas (trade unionist) (1876–after 1936), Welsh trade union leader
• Thomas Lucas (cricketer) (1852-1945), Australian cricketer
• Thomas Lucas (water polo) (born 1989), Dutch water polo player on the Netherlands men's national water polo team