Telco or TELCO may refer to:

• Telephone company, a provider of telecommunications services, such as telephony and data communications
  • Telco, one of the companies that formed the Telecommunications Services of Trinidad and Tobago
  • Telco Systems, a telecommunications systems manufacturer based in Mansfield, Massachusetts, USA
• TATA Engineering and Locomotive Company, an Indian automobile company firm
• Tokyo Electric Light Co, predecessor of TEPCO