An OM1 multimode fiber patch cable is an optical cable used for transmitting data over short to moderate distances within local area networks (LANs), data centers, and other similar applications. OM1 refers to the optical multimode category defined by the Telecommunications Industry Association (TIA).

The core diameter of an OM1 multimode fiber patch cable is typically larger than that of single-mode fiber, ranging from 50 to 62.5 microns (μm).