Kōsō Abe (阿部 孝壮, Abe Kōsō^?, 24 March 1892 – 19 June 1947) was an admiral in the Imperial Japanese Navy during World War II.

A native of Yamagata prefecture in northern Japan, Abe was a graduate of the 40th class of the Imperial Japanese Naval Academy in 1912. He ranked 73rd out of 144 cadets. He served as midshipman on the cruisers Azuma and Yakumo from 1912–1913, and after commissioning as an ensign in 1915, was assigned to the cruiser Izumo. He returned to naval artillery and torpedo school later that year, and did not graduate until late 1917, so he was unable to participate in combat operations in World War I.

As a lieutenant from 1918, lieutenant commander from 1924, and commander from 1930, he served as chief gunnery officer on the destroyers Yamakaze and Akikaze, cruisers Asama, Naka and Ashigara, and battleships Haruna, Yamashiro and Hyūga. He was promoted to captain on 15 November 1934.

Abe was given his first command on 15 November 1935, the cruiser Jintsu. He subsequently served as captain of Naka, Tenryū, Mikuma, Myōkō, and Hiei in the 1930s.