Admiral Otto Emil Lybeck (19 February 1871 – 21 April 1947) was a Swedish Navy officer.

Lybeck's senior commands include Minister of Defence, Commander-in-Chief of the Coastal Fleet and Chief of the Naval Staff.

[3] Several times nominated as councilor of the Naval Pension Fund (Flottans pensionskassa), Lybeck was, due to his outstanding ability and great work ability, engaged for a variety of special assignments, such as assisting the 2nd Defence Preparation in 1914, secretary of the Committee on Defence that same year, expert for special assignment within the Ministry for Civil Service Affairs in 1915, expert in the Ministry for Naval Affairs for an inquiry into wage regulation for the navy's personnel and for investigation concerning certain naval defense needs (1915–16), member of the international commission in The Hague in 1917, chief arbitrator in the international commission in Berlin concerning the treatment of raised ships in 1917, expert in arbitration in Copenhagen concerning international law cases between Germany and Denmark in 1918 and more.

He then served as commanding officer of the 4th Coastal Defence Ship Division (Fjärde pansarbåtsdivisionen) from 1922 to 1923 and as Inspector of the Submarine Force (Inspektör för ubåtsvapnet) in 1924.

The funeral service was held on 25 April 1947 at Klara Church, after which cremation took place in the Chapel of the Holy Cross at Skogskrematoriet [sv].