The Southampton Boat Show, also called the Southampton International Boat Show, is an on-water boat show, one of the largest in Europe and the biggest of its type in the UK. The show is held annually in September in Mayflower Park, Southampton, England. The Southampton Boat Show is run by British Marine, the trade association for the leisure, superyacht and small commercial marine industry.

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The Southampton Boat Show is an important sales platform for both national and international businesses, attracting over 110,000 visitors. The show attracts high net worth individuals from the UK and around the world, with an attendance sex ratio of 77% male, 23% female and an average age of 51 years. The average amount spent at each show is over £880 per head (excluding spending on boats).^[1]

The show began in 1969.^[2] Since September 1997, the Boat Show has been a ten-day event, after the passing in July of the Southampton International Boat Show Act 1997 that allows Mayflower Park to close for 10 days instead of 9.^[3] Past events have attracted a large number of visitors, with more than 123,000 attending the 2004 event.^[4] The 2005 event featured a makeshift beach, with tonnes of sand being imported to the event.^[5]

The exhibitors at the Boat Show cover every aspect of the leisure marine industry from boat builders, sail makers, chandlers and engine manufacturers to marine finance, clothing specialists, navigation equipment.^{[citation needed]} There are thousands of boats, brands, products and suppliers for the ten day Show.^{[citation needed]}

British Marine is the trade association for the UK boating industry. Run by the industry, for the industry, the profits from both Shows are reinvested back into the UK leisure marine industry through the services and representation provided by British Marine.^{[citation needed]} British Marine has over 1,600 members, which account for a substantial amount of the industry's turnover and employ around 30,000 people.^{[citation needed]} They are drawn from both the seagoing and inland sectors of the marine industry covering the leisure boat, hire fleet, commercial work boat and superyacht categories and supporting services.^{[citation needed]}