Oulton Broad South railway station is on the East Suffolk Line in the east of England, and is one of two stations serving Oulton Broad, Suffolk. The other is Oulton Broad North on the Wherry Lines. Oulton Broad South is the next station along from Lowestoft on the line to Ipswich, and from Lowestoft the line crosses Mutford Bridge with a view of Lake Lothing to the east and Oulton Broad Lake to the west. The station is 115 miles 42 chains (185.9 km) measured from London Liverpool Street via Ipswich.

The East Suffolk line is an un-electrified 49-mile secondary railway line running between Ipswich and Lowestoft in Suffolk, England. The traffic along the route consists of passenger services operated by Greater Anglia, while nuclear flask trains for the Sizewell nuclear power stations are operated by Direct Rail Services.