Captain Richard Gustav Borgelin (10 February 1887 – 8 December 1966) was a Danish officer and company commander of the Danish-Baltic Auxiliary Corps (DBAC) in 1919 during the Estonian and Latvian War of Independence.

Borgelin attended and successfully ended his education at the Royal Danish Military Academy in 1909.

In 1919, when Borgelin was officer of the reserve and in charge of the Second Regiment Corporal School at the Værløse Camp in northern Zealand, he was given the offer of becoming company commander of a combat unit consisting of 200 men.

[2] In gratitude for his services to the Estonian state, Borgelin was granted Maidla manor in Estonia.

[4] During World War II, Borgelin enlisted as an Abwehr agent for Germany after the occupation of Denmark.