Knutsen & Ludvigsen (English: Tootson and Ludiwood) was a Norwegian singing duo consisting of Øystein Dolmen ("Knutsen") and Gustav Lorentzen ("Ludvigsen").^[1]

Writing and performing various songs mostly aimed at children, they released seven albums, two of which received Spellemannprisen, the Norwegian Grammy.^[2] They had several #1 hits, including "Grevling i taket", "Hallo! Hallo!" and "Dum og deilig". Since the late 1990s, they have enjoyed a cult status among young Norwegians, performing a series of reunion concerts.^[1]

October 26, 2006, TV 2 broadcast the program Knutsen & Ludvigsen - The Full Story. The Norwegian Pop & Rock Encyclopedia says: "This was more than a famous duo - Knutsen & Ludvigsen was an institution. The whole rock generation of the nineties was nourished by their records."^[3]

On 21 April 2010, Gustav Lorentzen died from a heart attack while participating in an orienteering race near Bergen. He was 62.

• Knutsen & Ludvigsen (1970)
• Brunost no igjæn (1972) #23^[4]
• Nr. 3 - Tut (1974)
• Bakklandet Bassangforening: Ned Med Nidaros (1975)
• Du milde Mosart! (1977)
• Fiskepudding! Lakrisbåter! (1980) #13^[4]
• Juba Juba (1983) #3^[4]

• Samleplate (1984)
• Knutsen & Ludvigsens Beste (1996) (Translated: Best) #4^[5]
• Knutsen & Ludvigsens Ver'ste' (1997) (Translated pun: Worst/Workshop)
• Dum og Deilig: Knutsen & Ludvigsens Beste (2008) #10^[5]

• Knutsen & Ludvigsen og den fæle Rasputin (2015) (International title: Two Buddies and a Badger)