Events from the year 1786 in Denmark.

• Monarch – Christian VII^[1]
• Prime minister – Andreas Peter Bernstorff

• 4 March – The sc^{[clarification needed]} hool Efterslægtselskabets skole is founded in Copenhagen.^[2]
• 27 April – HDMS Indfødsretten is launched at Nyholm in Copenhagen.^[3]
• 25 August – The Great Agricultural Commission (Den Store Landbokommision) is set up with the task of rethinking the relationship between landowners and tenant farmers. It is formally abolished in 1816 but is inactive from 1802.^[4]
• 26 September – Christian VII visits London.

• 3 January – Ole Jørgen Rawert, government official and topographic painter (died 1851)
• 8 January – Christen Niemann Rosenkilde, actor (died 1861)
• 28 January – Nathaniel Wallich, botanist (died 1854)
• 12 March – Bendix Grodtschilling the Youngest, painter (died 1737)
• 15 September – Frederik Treschow, supreme court attorney, politician, landowner and philanthropist (died 1869)
• 18 September – Christian VIII, King of Denmark (died 1848)^[5]
• 23 October – Lewin Jürgen Rohde, naval officer and harbour master (died 1857)
• 14 November – Simon Aron Eiberchutz, businessman and philanthropist (died 1856)^[6]
• 13 December – Daniel Bentley, civil servant (died 1869)

• 8 January – Johan Mandelberg, painter (born 1730)
• 16 March – Cecilie Christine Schøller, socialite (born 1720).
• 29 December – Johan Herman Wessel, poet, playwright (born 1742)