Murlough Nature Reserve is a dune heathland on the coast of County Down in Northern Ireland, near Newcastle.

[2] In 1857, Arthur Hill, 4th Marquess of Downshire built Murlough House as a summer residence on the peninsula.

23 butterfly species have been recorded at Murlough NNR, the marsh fritillary (Euphydryas aurinia), is of European importance - other notable species include dark-green fritillary (Argynnis aglaja), grayling (Hipparchia semele) and cryptic wood white (Leptidea juvernica).

787 species of moth have been recorded at Murlough Nature Reserve - examples include small elephant hawkmoth (Deilephila porcellus), sand dart (Agrotis ripae) and the micro moths Pyrausta cingulata and Hysterophora maculosana.

Notable migrant species noted in the area have included: cosmopolitan (Leucania loreyi), white-speck, the delicate.