Allied Telesis (アライドテレシス, Araido Tereshisu), formerly Allied Telesyn, is a network infrastructure–telecommunications company headquartered in Tokyo, Japan, with other branches in San Jose, California. The company was established in 1987 as a provider of Ethernet and IP access equipment along with IP triple play networks over copper and fiber access infrastructure.

Allied Telesis is primarily a provider of equipment for enterprise customers, educational and government segments, and businesses. The company offers POTS-to-10G iMAP (integrated Multiservice Access Platform) and iMG (intelligent Multiservice Gateways) with secure VPN routing equipment.