Colombo Public Library is the largest public library in Sri Lanka, located in Colombo 07, Sri Lanka.

It was ysed exclusively by civil and military officers of the Government stationed in Colombo and was housed in a building opposite the Queen's House, on Janadhipathi Mawatha (formerly Kings Street).

The Colonial Secretary, Sir Cecil Clementi, called a meeting of subscribers of both libraries, and they agreed to hand over their books to the new library, which was to be run as a department of the Colombo Council.

The Colombo Library was opened on 10 August 1925 in a mansion, 'Sirinivasa', built by Mudaliyar Simon Fernando Sri Chandrasekera (who bequested the building to the government), on Sir Marcus Fernando Mawatha (formerly Edinburgh Crescent).

It had approximately 16,000 books, 94 members and seven staff, with S. C. Blok as the first principal librarian.