Tau2 Aquarii (τ2 Aqr, τ2 Aquarii) is the Bayer designation for a star in the equatorial constellation of Aquarius. It is visible to the naked eye with an apparent visual magnitude of +4.0. This is an orange-hued giant star with a stellar classification of K5 III. The measured angular diameter, after correction for limb darkening, is 5.12 ± 0.05 mas. At an estimated distance of 318 light-years (97 parsecs) based on parallax measurements, this yields a physical size of about 53 times the radius of the Sun.