Hattori Kazutada (服部 一忠, died July, 1595) was a samurai during Sengoku period in Japan.
He started out as a page to Oda Nobunaga and fought as a pikeman against Imagawa Yoshimoto during the Battle of Okehazama in 1560.
After Nobunaga's assassination, he transferred his allegiance to Toyotomi Hideyoshi and was awarded with lower 5th court rank in 1585.
Following the Battle of Odawara in 1590, he was awarded with Matsuzaka Castle in Ise Province, with revenues of 35,000 koku, and was appointed to assist Hideyoshi's proclaimed successor, Toyotomi Hidetsugu.
He fought in the Bunroku Campaign in Korea (1592-1593), successfully taking the Korean capital of Seoul.