26 Proserpina is a main-belt asteroid discovered by German astronomer R. Luther on May 5, 1853.

It is named after the Roman goddess Proserpina, the daughter of Ceres and the Queen of the Underworld.

Another main-belt asteroid, 399 Persephone, discovered in 1895, is named after her Greek counterpart.

Photometric observations of this asteroid have produced discrepant estimates of the rotation period.

Observations made in 2007 at the Oakley Observatory in Terre Haute, Indiana produced a light curve with a period of 13.06 ± 0.03 hours and a brightness variation of 0.21 ± 0.01 in magnitude.