This volume consists of contributions by the main participants of the 3rd International Colloquium on Differential Geometry and its Related Fields ICDG2012 which was held in Veliko Tarnovo Bulgaria Readers will find original papers by specialists and well organized reports of recent developments in the fields of differential geometry complex analysis information geometry mathematical physics and coding theory This volume provides significant information that will be useful to researchers and serves as a good guide for young scientists It is also for those who wish to start investigating these topics and interested in their interdisciplinary areas