Arkley South Fields are a Site of Borough Importance for Nature Conservation, Grade II, in Arkley in the London Borough of Barnet. It is an extensive area of set-aside agricultural fields with hedgerows and ditches. It is not of great botanical interest, and its conservation value lies in its breeding birds, especially skylarks, a declining species which is a priority under the UK Biodiversity Action Plan. It also supports breeding meadow pipits, kestrels, reed buntings, whitethroats, willow warblers and green woodpeckers.