The Marine Society & Sea Cadets is seafarers' charity in the United Kingdom and the national organisation for sea cadets.

It was formed in 2004 when the Sea Cadets and The Marine Society merged.

It is a registered charity in England, Wales[1] and Scotland.

It consists of about 400 units and 15,000 young people learning nautical and life skills.

[3][failed verification] Its headquarters is in Lambeth, in London, in the former Archbishop Temple Boys School.