Werner Hans Frederik Abrahamson Læssøe (1811-1850) was a Danish officer known for his service in the First Schleswig War.

Læssøe became a lieutenant in an infantry regiment in 1830, was a student at the War College in 1832-1836 and was then employed in the general staff, where he was promoted to captain in 1842.

For several years he was engaged in measurement and mapping work, which in recent times benefited Hedeselskabet's water supply plans, and served 1844-1845 as a teacher at the war academy, but was removed from this place, because his excessive independent ideas made him less popular with foremen, especially as he was politically leaning towards the National Liberal Party.

On this occasion, Læssøe came into conflict with the Minister of War, who questioned the competence of the army's leadership.

[4] But when General Olaf Rye was given the task of leading the withdrawal of the Danish army in 1849, he got Læssøe with him in his staff, and he participated in the Battle of Kolding .