VCO may refer to:

Military

• Veterinary Corps Officer, see Veterinary corps (disambiguation)
• Viceroy's commissioned officer, British Indian Army role (1885–1947)

Technology

• Voltage-controlled oscillator, an electronic device
• Voice Carry Over, a telecommunications relay service
• Akatsuki (spacecraft), or the Venus Climate Orbiter
• Virtual Central Office, in Open Platform for NFV network-function virtualization software

Other uses

• Voyage Century Online, a nautically themed, free-to-play, massively multiplayer online role-playing game
• Vice Commodore, an elected yacht club committee member
• VCO SA, the joint-stock company, and a distributor of Volcano clothing brand

This disambiguation page lists articles associated with the title VCO.
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