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The RHS Chelsea Flower Show also known officially as the Great Spring Show, is a garden show held each year on five days in May by the Royal Horticultural Society ("RHS") in the grounds of the Royal Hospital Chelsea in Chelsea, London, England. It is the most famous such show in the United Kingdom, perhaps the most famous gardening event in the world and part of London's summer social season. The latest flower show is scheduled to be held from 19–23 May 2009 and the Flower Show is considered to be the ultimate event in the gardening year.

It sets the latest gardening trends, features the newest and most desirable gardening products and creates an explosion of colours and scents adored by many a visitor.

The RHS Chelsea Flower Show showcases cutting-edge garden design and thousands of perfect blooms; top growers and world class designers; scents and sights and shopping galore. Chelsea is usually crammed with leading lights, big name designers and the flower show has enchanted millions of visitors to embark on horticulture as a hobby.