Watford (ⁱ/ˈwɒtfərd/) is a town and borough in Hertfordshire, England, situated 17 miles (27 km) northwest of central London and inside the circumference of the M25 motorway. It is not to be confused with Watford, Northamptonshire which is 55 miles to the north.

The town developed on the River Colne on land belonging to St Albans Abbey until the 16th century. During the 12th century a charter was granted allowing a market and building St Mary's Church began. The town grew modestly, assisted by travellers passing through to Berkhamsted Castle and the royal palace at Kings Langley. A big house was built at Cassiobury in the 16th century. This was partly rebuilt in the 17th century and another substantial house was built nearby at The Grove. Connections with the Grand Junction Canal (from 1798) and the London and Birmingham Railway (from 1837) allowed the town to grow more rapidly, with paper-making mills, such as John Dickinson and Co. at Croxley, influencing the development of printing in the town which continues today. Two brewers Benskins and Sedgwicks flourished in the town until their closure in the late 20th century. Hertfordshire County Council designates Watford, along with Stevenage, to be its major sub-regional centre. Several head offices of national companies and multi-nationals are based in Watford. Both the 2006 World Golf Championship and the 2013 Bilderberg Conference took place at The Grove hotel.

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