Reiko Sakamoto (Japanese: 坂本 礼子, born 1939) is a Japanese mathematician affiliated with Nara Women's University.[1] Her teachers have included Sigeru Mizohata and Masaya Yamaguchi;[2] her students have included Yoshihiro Shibata.[3] She is known for her research on mixed boundary conditions for hyperbolic partial differential equations,[4] for which she won the 1974 Iyanaga Prize of the Mathematical Society of Japan,[5] and for her book on hyperbolic boundary value problems.[6]