Abstract: Inhibitors of HDAC and G9a inhibitors such as, for example, single compounds that inhibitor both HDAC and methyltransferase G9a (referred to herein as dual HDAC-G9a inhibitors, dual HDAC-G9a compounds, and dual HDAC-G9a inhibitor compounds) are described herein. For example, dual inhibitor compounds of Formulae I-III and methods of making and using thereof, are described herein. The dual inhibition activity of these compounds can provide inhibition of both histone deacetylase (HDAC) and histone methyltransferase G9a thereby providing anti-cancer effects.