Moji-ku (門司区) is a Japanese ward of the city of Kitakyushu in Fukuoka Prefecture. It is the former city of Moji which was one of five merged to create Kitakyūshū in 1963. It faces the city of Shimonoseki across the Kanmon Straits between Honshū and Kyūshū.
The ward's area is 73.37 km². It had a population of 114,754 as of 2000.