St Agnes (Cornish: Agenys)[1] is the southernmost populated island of the Isles of Scilly.

Without the Gugh included, St Agnes is marginally smaller than Bryher in either population or area; however if Gugh is included with St Agnes, it is Bryher that is marginally smaller in area and population.

In earlier times many men from St Agnes earned a living as pilots, guiding transatlantic liners and other vessels through the English Channel.

Accommodation is limited, and St Agnes is the only populated island in the Isles of Scilly which has no hotel.

[2] The island's most notable landmark is its lighthouse, which has been converted into living accommodation as the tower no longer contains a light.

In 1707, many of the sailors who had drowned in the great naval disaster off the Isles of Scilly were reputedly buried on the St Agnes playing field.

[6] The church features stained-glass windows locally made by artists Marigold and Oriel Hicks.

Secondary pupils board at the St Mary's main campus,[9] staying there on weekdays and coming back and forth to their home islands on weekends.

In the south of the island Wingletang Down is noted for its heath, dune grassland and rocky coast and is the only site in Britain where the fern least adder's–tongue (Ophioglossum lusitanicum) grows.

Other rare plants include the orchid autumn lady's-tresses (Spiranthes spiralis) and early meadow-grass (Poa infirma).

[27] St Agnes returns one councillor to the Council of the Isles of Scilly, the same as the other "off-island" wards.