Royal Northumberland Yacht Club is a private members' club founded in 1890, situated within Blyth South Harbour on the River Blyth in Northumberland.

The club maintains around 120 members' moorings, most with electricity and water connections, and has approximately 600 members. Its clubhouse is the HY Tyne III, a Trinity House Light Vessel (LV50) built in 1879.

Visiting yachts should contact Blyth Harbour on Channel 12 for permission to enter the river before proceeding to the Visitors' Pontoon in South Harbour; advance contact with the club is recommended to confirm availability.

The club is an RYA Training Centre offering theory and practical courses, runs a regular racing programme and social calendar, and publishes its own pilot book covering the coast from the Humber to Rattray Head.