This document provides a summary of Gartner's 2015 Magic Quadrant report on cloud infrastructure as a service (IaaS) providers worldwide. It defines cloud IaaS and outlines the evaluation criteria used to assess providers, including their ability to execute on products/services and customer experience, as well as vision. The report evaluates major public and private cloud IaaS providers and provides an assessment of their strengths and cautions for customers to be aware of.