The Marine Conservation Society is a UK-based charitable organisation working with businesses, governments and communities to clean and protect oceans.

Founded in 1978 as the Underwater Conservation Society, the group claims to be working towards "cleaner, better-protected, healthier UK seas where nature flourishes and people thrive."

[1] The Clean Seas team works to reduce pollution on beaches and in oceans by encouraging change within the public, industry, and government.

[4] The Marine Conservation Society is a membership organization and relies on income from members, individual donations and corporate support.

[12] The charity's "Great British Beach Clean" project won the BBC Countryfile magazine "Award for the Conservation Success of the Year" in 2018.