Fredrik Wilhelm von Otter (11 April 1833 – 9 March 1910) was a Swedish friherre, naval officer and politician, most notably serving as Prime Minister of Sweden from 1900 to 1902.

He entered the Royal Swedish Navy as second lieutenant at the age of 17, but remained without promotion for a long time.

In 1874 he was promoted to captain and appointed Ministry for Naval Affairs in the cabinet, succeeding Major General Baron Abraham Leijonhufvud.

He remained in this position until the resignation of the De Geer cabinet in 1880, after which he was appointed director of the naval shipyard in Karlskrona.

After the resignation of Erik Gustaf Boström in 1900, Otter was offered the premiership by the king and formed a cabinet which would remain in office for two years.