This book titled "Study on Certain Aspects of Dark Energy Cosmological Models" is devoted to study of dark energy cosmological models in alternative theories of gravitation namely, Brans-Dicke, Saez-Ballester and $f(R)$ theories of gravitation. It mainly concentrated on the investigation of certain anisotropic dark energy models in alternative theories of gravitation that allowed us to map the entire history of cosmic evolution from early times to the late stages of the Universe and also, these models will indicate the present scenario accelerated expansion of the Universe.