The Isles of Scilly are a small archipelago located off the southwestern tip of mainland Cornwall in England, United Kingdom. Situated approximately 25 miles from the coast, they form part of the ceremonial county of Cornwall, though they have maintained a separate local authority since 1890. The islands lie at coordinates 49.9200, -6.3000, with St Agnes being the southernmost point, located over four miles further south than Lizard Point on the British mainland.

Historically, the islands may correspond to the Cassiterides and were part of the Brittonic Celtic kingdom of Dumnonia before a short-lived English conquest in the 10th century. Rising sea levels around 400–500 AD flooded the central plain of the former single island Ennor, creating the current group of fifty-five islands. The name Scilly first appeared in 1176, and the area has been under Norman control since the conquest, with the Duchy of Cornwall owning most freehold land today.

St Mary's serves as the main island and base for visitors, while four other inhabited off-islands include Tresco, known for its Abbey Gardens. The landscape is defined by scenic beauty and mild climate, fostering sub-tropical flora. Much of the land is preserved by the Duchy of Cornwall and the Council of the Isles of Scilly to protect wildlife and character. The islands are collectively designated as an Area of Outstanding Natural Beauty, reflecting their significant environmental value.

Tourism is a major component of the local culture, alongside agriculture, particularly cut flower production. The mild climate allows for unique flora, attracting visitors seeking a balmy environment distinct from mainland England. The term Scillonian is used for people or things related to the archipelago, though proper usage distinguishes between Islanders and residents. The area avoids high-rise development, maintaining a historic character that appeals to those seeking tranquility and natural beauty.

The population was recorded as 2,100 in the 2021 United Kingdom census, with a majority living on St Mary's and close to half in Hugh Town. The economy relies heavily on tourism and agriculture, supported by limited transport capacity that requires advance booking. The climate is mild and sunny, influenced by the Gulf Stream, making it warmer in winter and cooler in summer than mainland England. Frost is rare, supporting the local flower industry and year-round visitor appeal.