CTO may refer to:

• Cancelled-to-order, a postage stamp that was cancelled by the postal administration before being sold to stamp collectors
• the ICAO airline designator for Cape Air Transport, Australia
• Caribbean Tourism Organisation
• Central Treaty Organisation
• Centrum Techniki Okrętowej - Ship Design and Research Centre, Poland.
• cervical-thoracic orthosis
• Chief technical officer or chief technology officer, both describe the same function
• Color temperature orange, a color gel
• Commonwealth Telecommunications Organisation
• Community treatment order, a mental health law
• Configure-to-order, in business, the ability of a user to configure a product before ordering
• Control Tower Operator, an aviation term for certain personnel working in a control tower

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