Mizuko (written: 瑞子 or みず子) is a feminine Japanese given name. Notable people with then name include:
Mizuko Ito (伊藤 瑞子; born 1968), Japanese cultural anthropologist
Mizuko Masuda (増田 みず子; born 1948), Japanese writer
Mizuko Nanbu (南部 瑞子; 1908–1980), Director of the Girl Scouts of Japan
Takahashi Mizuko (高橋 瑞子; 1852–1927), Japanese physician
The name is not generally written with the kanji 水子, meaning water child, due to the combination also meaning a stillborn baby.