This AIAA guideline provides technical information for the development of spacecraft utility connectors. A historical perspective on utility connectors has been documented from aerospace historical applications on commercial and military aircraft, rocket launch vehicles, and NASA programs. Designers and project managers of future spacecraft can benefit from this document. A utility connector contains multiple utilities, which may include electrical power, data, microwave, fiberoptic, and fluids. This document classifies utility connectors as follows: Class I-Manual or EVA; Class II-Robotic System; and Class III-Automatic System. The use of standard utility connectors will contribute to cost effective on-ground and on-orbit servicing functions.