This is known as Einstein's Cross; it is a galaxy, or at least the effect caused by one. I've posted a few pictures of the Abell 370 gravitational lens, where the cumulative gravity of the galaxy cluster acts as a giant lens magnifying and distorting the light that passes through it. This invisible galaxy is doing something similar. It sits between us and a distant quasar, and its gravity distort's the quasar's light into that cloverleaf shape.
Image Credit and License: J. Rhoads (Arizona State U.) et al., WIYN, AURA, NOIRLab, NSF