|• Mayor (2019)||Hans Kristian Ranaas (Sp)|
|• Total||86 km2 (33 sq mi)|
|• Land||85 km2 (33 sq mi)|
|Area rank||395 in Norway|
|• Rank||81 in Norway|
|• Density||188/km2 (490/sq mi)|
|• Change (10 years)||9.14%|
|Time zone||UTC+01:00 (CET)|
|• Summer (DST)||UTC+02:00 (CEST)|
|ISO 3166 code||NO-3022|
|Official language form||Bokmål|
Frogn is a municipality in former Akershus now Viken county, Norway. It is part of the Follo traditional region. The administrative centre of the municipality is the town of Drøbak. Frogn was established as a municipality on 1 January 1838 (see formannskapsdistrikt). The city of Drøbak was merged with Frogn on 1 January 1962.
The municipality (originally the parish) is named after the old Frogn farm (Old Norse: Fraun), since the first church was built here. The name must be very old and the meaning is unknown. One theory is that it is derived from the Norse word frauð which means "manure" and the meaning would then be "the fertilized field". (See also Frogner and Tøyen.)
Prior to 1889, the name was written "Fron". Between 1837 and 1865, the name of the municipality was Drøbak landdistrikt.
The coat-of-arms is from modern times. They were granted on 20 May 1988. The arms symbolize the Oscarsborg Fortress in silver on a blue background. The fortress is on the Drøbaksund in the Oslofjord in the municipality. The fortress was built in the late 19th century and played a major role in the defence of Norway in the beginning of World War II.
- Niels Carlsen (1734 in Drøbak – 1809) a timber merchant, landowner, shipowner and banker
- Jens Carl Peter Brandt (1848 in Frogn – 1912) lawyer, property owner and Mayor of Frogn, 1884 to 1895
- Carl Julius Evensen (1851 in Drøbak – 1937) a Norwegian shipmaster and Antarctic explorer
- Gunnar Isachsen (1868 in Drøbak – 1939) a Norwegian military officer and polar scientist
- Louise Isachsen (1875 in Drøbak – 1932) a physician, Norway's first female surgeon
- Per Deberitz (1880 in Drøbak – 1945) a Norwegian neo-impressionist painter
- Viggo Brun (1885–1978 in Drøbak) a professor, mathematician and number theorist
- Noralv Teigen (1932 – 2017 in Drøbak) an actor, theatre instructor and theatre director 
- Øystein Øystå (1934–2014) a Norwegian writer and long-jumper, lived in Drøbak
- Olav Skjevesland (1942 in Drøbak – 2019) theologian, Bishop of Agder og Telemark
- Martin Schanche (born 1945) former racing driver, now aspiring politician, lives in Drøbak
- Terje Mikkelsen (born 1957 in Drøbak) a Norwegian conductor
- Solveig Kringlebotn (born 1963 in Drøbak) Norwegian operatic soprano
- Sven Ombudstvedt (born 1966) a businessperson, CEO of Norske Skog, lives in Drøbak
- Arifur Rahman (born 1984) a Bangladeshi-Norwegian political cartoonist, illustrator and animator; lives in Drøbak
- Gunnar Andersen (1890 in Drøbak – 1968) a footballer with 46 caps for Norway and ski jumper
- Tore Johannessen (1922–2005) an ice hockey referee, lived in Drøbak
- Pål Trulsen (born 1962 in Drøbak) a curler, team gold medallist at 2002 Winter Olympics
- Kristin Størmer Steira (born 1981) a retired cross-country skier, lives in Drøbak
- Andrine Tomter (born 1995 in Drøbak) a footballer with 170 club caps and 16 with Norway women
Twin towns — Sister cities
- "Navn på steder og personer: Innbyggjarnamn" (in Norwegian). Språkrådet.
- "Forskrift om målvedtak i kommunar og fylkeskommunar" (in Norwegian). Lovdata.no.
- Henriksen, Petter, ed. (2007). "Drøbak landdistrikt". Store norske leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Retrieved 16 October 2009.
- Norske Kommunevåpen (1990). "Nye kommunevåbener i Norden". Retrieved 2008-12-18.
- "Immigrants and Norwegian-born to immigrant parents, by immigration category, country background and percentages of the population". ssb.no. Archived from the original on 2 July 2015. Retrieved 29 June 2015.
- IMDb Database retrieved 08 March 2021
- "Vennskapskommuner" (in Norwegian). Frogn municipality. Archived from the original on July 13, 2008. Retrieved 2008-12-18.