The Blacktown Workers Rugby League Football Club, also known as Blacktown Workers Sea Eagles, are an Australian rugby league football club based in Blacktown, New South Wales formed in 1962. Since 2017 they have had a side in the NSW Cup, as the feeder team to the Manly Warringah Sea Eagles.

The NSW Cup, currently known as the Knock-On Effect NSW Cup for sponsorship reasons, is a rugby league competition for clubs in New South Wales. The competition has a history dating back to the NSWRFL's origins in 1908, starting off as a reserve grade competition, and is now the premier open age competition in the state. The New South Wales Cup, along with the Queensland Cup, acts as a feeder competition to the National Rugby League premiership. The competition is the oldest continuous rugby league competition in the Australia.