The Leo Triplet, consisting of the spiral galaxies M65, the M66, and the NGC 3628, is also called the M66 group. The small group of galaxies is about 35 million light-years in the constellation LEO.
In close proximity is the M96 Group. It is believed that these two groups may be separate parts of a much larger group. There is also some group identification algorithms that identify the Leo Triplet at part of the M96 Group.