This book is designed to be an advanced undergraduate or graduate level text book on Extragalactic astrophysics. It is specifically designed for programs that do not have separate classes in cosmology and galactic structure. The book contains mathematical rigor including some general relativity and covers most topics in galactic structure, galaxy evolution, and cosmology. Created using lecture notes gathered by the author over 15 years of teaching astrophysics, this book has been refined and updated as new discoveries have been made, and as theories have gained traction.