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The Battle of Horten Harbour or the Action at Horten was an engagement that occurred on 9 April 1940. It took place during Operation Weserübung, when the Germans launched an amphibious assault on Karljohansvern, the Norwegian naval base at Horten. After being initially repulsed by Norwegian naval units, German troops headed overland to outflank the base, forcing it to capitulate.

Horten Church (Norwegian: Horten kirke) is a parish church of the Church of Norway in Horten Municipality in Vestfold county, Norway. It is located in the town of Horten. It is one of the churches for the Horten parish which is part of the Nord-Jarlsberg prosti (deanery) in the Diocese of Tunsberg. The red brick church was built in a long church design in 1855 using plans drawn up by the architect Christian Heinrich Grosch. The church seats about 750 people.

is a town in Horten Municipality in Vestfold county, Norway. The town is located along the Ytre Oslofjord about 16 kilometres (9.9 mi) north of the town of Tønsberg and about 12 kilometres (7.5 mi) to the southeast of the town of Holmestrand. The town of Moss lies about 12 kilometres (7.5 mi) to the east, across the fjord. The 8.63-square-kilometre (2,130-acre) town has a population (2023) of 20,859 and a population density of 2,418 inhabitants per square kilometre (6,260/sq mi).

Preus Museum is the national museum for photography located in Horten, Norway. Preus Museum was founded in 1976 by Leif Preus and the members of the Preus family as a private museum. The collection was acquired by the Norwegian government in 1995. The museum's collection consists of photos and various other forms of images, together with cameras and related equipment which illustrate the history of photography. In 2001, the museum moved to the former naval facility at Karljohansvern in Vestfold county. The facilities have been adapted for museum use based on the work of architect Sverre Fehn.

The Royal Norwegian Navy Museum (Norwegian: Marinemuseet) is a museum documenting the history of the Royal Norwegian Navy. It is located at the former main naval base of Karljohansvern in Horten. The museum was founded by C.F. Klinck on 24 August 1853. The museum is sometimes regarded as the world's first naval museum, as it was the first collection of naval memorabilia open to the public.

Citadellet (Citadel) was a 19th-century Norwegian fortress. The last day of military activity was in 1970. The fort was demolished in 1971. Citadellet was intended to protect the Royal Norwegian Navy's Karljohansvern naval station in Horten. Karjohansvern was the main base for the Royal Norwegian Navy from 1819 to 1963. The fortress was built between 1848 and 1851. Its architect was Christian Heinrich Grosch (1801-1865). The fort were established in conjunction with Norske Løve Fortress which was built between 1852 and 1859. Specific plans for the design of both fortifications were first completed in the mid-1830s, based upon designs largely begun in the 1820s. The forts were expected to assume a key role as defender of the fleet and defense against attacks from the sea.

Karjohansvern (Karljohansvern Orlogsstasjon, KJV) at Horten was the main base for the Royal Norwegian Navy from 1850 to 1963.

Horten Station (Norwegian: Horten stasjon) is a former railway station in Horten, Norway, which was the terminus of the Horten Line and in use between 1881 and 1967. The station was designed in Swiss chalet style by Balthazar Lange and was wedged between the town and the Oslofjord. It was located 106.51 kilometers (66.18 mi) from Oslo. When the Vestfold Line was being planned, some plans called for it to run via Horten. Instead, a more inland route was chosen and a 7.0-kilometer (4.3 mi) branch line was built to the town. Traffic peaked in the 1920s, when ca. 200,000 people traveled on the line, and the station saw a peak thirteen daily services during the 1940. The line past the station was converted to standard gauge in 1949 and electrified in 1957. By then the Norwegian State Railways (NSB) had started to run a bus service to Skoppum Station and gradually reduced service to Horten. From 1967 all passenger traffic was terminated. The station building has since burned down.

Sentrum Church (Norwegian: Sentrumskirken) is a parish church of the Church of Norway in Horten Municipality in Vestfold county, Norway. It is located in the town of Horten. It is one of the churches for the Horten parish which is part of the Nord-Jarlsberg prosti (deanery) in the Diocese of Tunsberg. The red brick church was built in a long church design in 1972 using plans drawn up by the architect Elisabet Fidjestøl. The church seats up to 300 people.

HNoMS Narvik (pennant number F304) was an Oslo-class frigate of the Royal Norwegian Navy. Narvik, the last active ship of the class, was transferred to the Royal Norwegian Navy Museum in Horten in 2007.

Norske Løve is the name of a 19th-century fortress built from 1852 to 1859 to protect Karljohansvern naval station at Horten in Norway.

German submarine U-1273 was a Type VIIC/41 U-boat of Nazi Germany's Kriegsmarine during World War II. She was ordered on 23 March 1942, and was laid down on 7 June 1943, at Bremer Vulkan-Vegesacker Werft, Bremen-Vegesack, as yard number 68. She was launched on 10 January 1944, and commissioned under the command of Oberleutnant zur See Karl-Heinz Voswinkel on 16 February 1944.