This document provides an introduction to forensic entomology. It discusses what entomology and forensic entomology are, and the importance of forensic entomology in determining things like time of death. It describes the biology of insects and those of forensic importance like blow flies and beetles. It discusses the life cycles of these insects and how the stages of decomposition relate to insect succession on a corpse. It covers how to collect entomological evidence and factors that can affect insect development, which is important for using insects to estimate time of death.