In particular, the study of derivations in prime or semi prime rings has yielded many interesting results. These results have applications in other branches. Many mathematicians of recent years studied derivations on rings with keen interest and their investigations throw light on the study of different types of generalized derivations on rings. Very few mathematicians had studied and contributed in the field of reverse derivations in rings. In this book we presented some results concerning to reverse derivations in rings. Throughout this book a ring is a synonym for an associative ring which does not have a unit element. In this book we presented some results on reverse derivations, generalized reverse derivations and Jordan reverse derivations in prime rings and semi prime rings.