Katwijk (Dutch pronunciation: [ˈkɑtʋɛik] ⓘ) is a coastal municipality and town in the province of South Holland, which is situated in the mid-western part of the Netherlands.

Katwijk is by far the largest town in the Duin- en Bollenstreek ("Dune and Bulb Region").

On 1 January 2005 the various districts had the following populations: Lying on the coast, Katwijk aan Zee is (and has always been) the larger town.

Rijnsburg is situated east of Katwijk aan den Rijn whereas Valkenburg finds itself to the south.

During World War II, Katwijk aan Zee was heavily damaged.

[5] On 1 January 2006, Rijnsburg and Valkenburg were also merged into the municipality, it's called nowadays Katwijk.

See here: Additionally, Rijnsburg and the far northeastern part of Katwijk-Noord are served by bus 20 and 21, running between Noordwijk and Leiden.

Grasshoppers Katwijk, are a basketball club established in 1971, playsling its home games at Cleijn Duin.

The boulevard along the shore is not spoiled by large hotels or apartment blocks and has not given in to an excessive commercialisation.

Although most buildings lining the boulevard are tourist apartments and pensions, most are just three floors high (and none more than five) and offer a distinctive 'feel' of the 1950s.