Harold Thomas

• Harold Thomas (artist), Indigenous Australian artist and activist, designer of the Aboriginal Australian flag
• Harold Thomas (rugby, born 1914), Welsh dual-code international rugby union and rugby league footballer
• Harold Thomas (rugby union, born 1883), Welsh rugby forward
• Harold Chester Thomas, U.S. Navy officer
• Harold Thomas (boxer), New Zealand Olympic boxer
• Harold Wolferstan Thomas, Canadian doctor
• USS Harold C. Thomas, an Evarts-class destroyer escort