Yoshioka Hansaku (吉岡 範策, 8 May 1869 – 19 March 1930) was an vice admiral of the Imperial Japanese Navy.

During the First Sino-Japanese War, he served under Captain Heihachirō Tōgō as a squadron officer on the protected cruiser Naniwa.

In 1904, he became a major in the Navy and participated in the Russo-Japanese War as chief gunnery officer of the Second Fleet flagship Izumo in the Battle of Tsushima.

In 1912, he became a member of the Grand Mourning Ceremony Navy Affairs Committee and a naval drill judge.

[3] After serving as captain of the Kongō, he was promoted to Rear Admiral in 1917 and became the second director of the Naval Education Headquarters.