The London Library is an independent lending library in London, established in 1841. It was founded on the initiative of Thomas Carlyle, who was dissatisfied with some of the policies at the British Museum Library. It is located at 14 St James's Square, in the St James's area of the City of Westminster, which has been its home since 1845. Membership is open to all, on payment of an annual subscription, and life and corporate memberships are also available. As of December 2021 the Library had over 7000 members.

A subscription library is a library that is financed by private funds either from membership fees or endowments. Unlike a public library, access is often restricted to members, but access rights can also be given to non-members, such as students.