Hachikō (ハチ公, November 10, 1923 – March 8, 1935) was a Japanese Akita dog remembered for his remarkable loyalty to his owner, Hidesaburō Ueno, for whom he continued to wait for over nine years following Ueno's death.

Hachikō was born on November 10, 1923, at a farm near the city of Ōdate, Akita Prefecture. In 1924, Hidesaburō Ueno, a professor at the Tokyo Imperial University, brought him to live in Shibuya, Tokyo as his pet. Hachikō would meet Ueno at Shibuya Station every day after his commute home. This continued until May 21, 1925, when Ueno died of a cerebral hemorrhage while at work. From then until his death on March 8, 1935, Hachikō would return to Shibuya Station every day to await Ueno's return.

During his lifetime, the dog was held up in Japanese culture as an example of loyalty and fidelity. Since his death, he continues to be remembered worldwide in popular culture with statues, movies and books. Hachikō is also known in Japanese as chūken Hachikō (忠犬ハチ公, 'faithful dog Hachikō'), with the suffix -kō originating as one once used for ancient Chinese dukes; in this context, it was an affectionate addition to his name Hachi.