The Clockmakers' Museum in London, England is a collection of clocks, watches and other horological items which belongs to the Worshipful Company of Clockmakers, which is one of the City of London Livery Companies. Until October 2014 it was housed in a gallery at the Guildhall and admission was free. As of November 2014 it is in transit to the Science Museum in London, where it will be available for public viewing in the summer of 2015.
The Clockmakers' Collection was begun in 1814. It is therefore the oldest collection specifically of clocks and watches in the world. It has been open to the public since 1874. The majority of items in the collection range from c.1600 to c.1850. The most important pieces include the marine timekeepers, in particular the celebrated fifth marine timekeeper completed by John Harrison in 1770 (H5).
In 2002 the museum was relaunched with refurbished displays. In addition to exhibiting clocks and watches it tells the history of clockmaking in London. There is also a rolling exhibition of 21st-century clocks and watches made by contemporary artists and craftsmen.
Located at the same site, but administratively incorporated into the Guildhall Library visiting horological scholars will also find the Library of Worshipful Company of Clockmakers, one of the major publicly-accessible collections of printed materials and manuscripts on British horology.