The Cosmic Horseshoe is the nickname given to a gravitationally lensed system of two galaxies in the constellation Leo.

Unlike most lensed galaxies, the shape of the lensed light of this background galaxy appears shaped like a horseshoe.

The foreground galaxy, LRG 3-757, is found to be extremely massive, with a mass a hundred times that of this galaxy.

It is notable because it belongs to a rare class of galaxies called luminous red galaxies, which has an extremely luminous infrared emission.

The system was discovered in 2007 by an international team of scientists[2] using the comprehensive Sloan Digital Sky Survey and is greatly studied by the Hubble Space Telescope.