Sir Harry James Veitch was an English horticulturist in the nineteenth century, who was the head of the family nursery business, James Veitch & Sons, based in Chelsea, London. He was instrumental in establishing the Chelsea Flower Show, which led to his being knighted for services to horticulture.

The RHS Chelsea Flower Show, formally known as the Great Spring Show, is a garden show held for five days in May by the Royal Horticultural Society (RHS) in the grounds of the Royal Hospital Chelsea in Chelsea, London. Held at Chelsea since 1912, the show is attended by members of the British royal family.