Iota Canis Majoris (ι CMa, ι Canis Majoris) is a star in the constellation Canis Major.
ι Canis Majoris is a blue-white B-type bright giant with a mean apparent magnitude of +4.36. It is approximately 3100 light years from Earth. This star has 24.9 times the radius of the Sun. It is classified as a Beta Cephei type variable star and its brightness varies from magnitude +4.36 to +4.40 with a period of 1.92 hours.