Otmoor RSPB Reserve is a bird sanctuary and nature reserve, managed by the RSPB, between Beckley and Oddington, within the wider area of Otmoor, in Oxfordshire, England. The reserve was established in 1997 and restored large areas of marshland from what had previously been farmland. The RSPB reserve covers around 1,000 acres.

Otmoor is made up of wet grassland, reedbed and blackthorn hedgerows. The wet grassland supports nationally significant lowland breeding waders with regularly over 100 pairs, including lapwing, redshank and snipe. The wet grassland is also home to huge numbers of wintering wildfowl and waders. Over 4000 golden plover, lapwing and wigeon, along with pintail, teal, shoveler and geese and swans call Otmoor their winter home.

In the summer, both black and brown hairstreak butterflies can be found feeding and laying eggs along the blackthorn hedges. These are managed rotationally to keep them in top condition for 2 of Oxfordshire’s most important butterfly species.

The reedbed has become home to bittern and marsh harrier who have returned as breeding birds to Oxfordshire for the first in over 200 years. Other species found breeding on the reedbed include common terns, reed warblers, water rails, grey herons and Cetti’s Warblers.