Over the past decade, the proliferation of fiber optic sensors and sensing systems has been ever increasing, especially the use of fiber Bragg grating (FBG) based sensors. These sensors have been mainly relegated to research applications with a few noted large-scale structural tests. The main sensing parameters for these tests have been strain and/or temperature. This paper discusses the development of accelerometers with FBG sensors as the measurement medium. The discussion includes a brief overview of FBG sensors, the functionality of FBG sensors as accelerometers, aspects of commercially available instrumentation for monitoring the accelerometers, and experimental data from three commercially available accelerometer designs. The purpose of this paper is to provide the modal analysis community with an understanding of the current state-of-the-art in fiber Bragg grating sensors for dynamic and vibration testing.