← 1890 1889 1888 1891 in Denmark → 1892 1893 1894
Decades:	1870s 1880s 1890s 1900s 1910s
See also:	Other events of 1891 List of years in Denmark

Events from the year 1891 in Denmark.

• Monarch – Christian IX^[1]
• Prime minister – J. B. S. Estrup

• 3 May – Vejle Boldklub is founded.

• 5 January – Grethe Glad, fashion designer and educator (died 1990)
• 2 March – Gerda Henning, designer (died 1951)
• 7 April – Ole Kirk Christiansen, entrepreneur and businessman, inventor of Lego (d.1958)
• 1 October – Svend Methling, actor (died 1977)

• 8 April – Elise Holst, stage actress (born 1811)
• 9 June – Ludvig Lorenz, mathematician and physicist (born 1829)
• 15 August – Louise Sahlgreenm actress (born 1818)
• 28 November – Christen Berg, politician (born 1829)
• 21 December – Georg Emil Hansen, photographer (born 1833)