Queen Adelaide is a hamlet on the River Great Ouse in the Fens about 1+1⁄2 miles (2.4 km) northeast of Ely, Cambridgeshire, England.

The hamlet did not exist until the 19th century, when the railways reached Ely and the pub was built.

The River Great Ouse is just to the east, and the section flowing north from the Queen Adelaide Bridge to the Sandhill Bridge at Littleport is known as the Adelaide straight, completed in 1829; it has been used as an emergency alternative to the River Thames for the Boat Race in 1944, and again in 2021, when Hammersmith Bridge in London was closed to river traffic.

[2] Queen Adelaide is in the Church of England parish of Ely Cathedral, which is 2 miles (3 km) away by road, so in 1883 a chapel of ease was built in the hamlet.

It was dedicated to St Etheldreda,[3] who was a 7th-century East Anglian princess and Abbess of Ely.