Optus is the second largest telecommunication company in Australia.

Optus provides integrated telecommunication services in Australia. The company delivers communications, information technology, and entertainment services. It offers mobile voice, data, and Wi-Fi services; local, national, and long distance telephony services; business network services; Internet and dial-up access, and satellite services; and subscription television services. The company also owns and operates a fleet of satellites in Australia and New Zealand that cover Asia, Hawaii, Norfolk Island, Papua New Guinea, Lord Howe Island, Cocos Island, and Christmas Island. In addition, it offers business with IP network connectivity and options that include mobile, IP converged solutions, information communications technology, voice, data, IP, and satellite. Optus provides services, such as disability services, hearing aids and mobile phones, and disability equipment. Further, the company offers voice over Internet protocol, voice over DSL, and transmission solutions. It serves corporate and government clients, and small and medium businesses. The company was founded as Optus Communications Pty, Ltd. and changed its name to Cable & Wireless Optus Pty, Ltd. in 1998. Further, it changed its name to Optus in 2001. The company is based in North Sydney, Australia. As of September 18, 2001, Optus is a subsidiary of Singapore Telecommunications, Ltd.