RSPB Leighton Moss is a nature reserve in Lancashire, England, which has been in the care of the Royal Society for the Protection of Birds since 1964.

[2] The site provides habitats for many species of wildlife, including bearded tits, marsh harriers, bitterns, otters and red deer.

Although the soil is of good quality, by 1918 the land was flooded again, as drainage appeared to have become uneconomic when the price of coal was high.

[5] The site is open to the public everyday except Christmas Day, with car parks, a Visitor Centre, shop (selling bird food, binoculars and nature-themed gifts), a cafe and an education room.

[12] Rare birds present at the site have included red-footed falcon, purple heron, Caspian tern, great reed warbler and Savi's warbler, whilst more recently, rarities have included American wigeon, great grey shrike, green-winged teal and European honey-buzzard in 2019.

Despite such control of ecological succession, the breeding bittern population (measured by "booming" males) suffered declines in the 1990s and 2000s.

In 2015 there was controversy about a plan to cull small numbers of red deer, which create significant damage to the reedbeds.