Baron Shibayama Yahachi (柴山 矢八, 13 July 1850 – 1 January 1927) was an admiral in the early Imperial Japanese Navy.

Although a close friend of Togo Heihachiro, he declined to join the military and did not participate in the Boshin War to overthrow the Tokugawa Shogunate.

On Shibayama's return to Japan, he entered the fledgling Imperial Japanese Navy as a naval artillery specialist.

Shibayama was instrumental in raising the sunken Russian Pacific Fleet from the bottom of Port Arthur harbor, salvaging the badly damaged warships, and placing them into service with the Imperial Japanese Navy.

[2] Shibayama was promoted to full admiral on 13 November 1905 and elevated to the rank of danshaku (baron) under the kazoku peerage system on 21 September 1907.