MCTS may reference:
- Marine Communications and Traffic Services, a radio service operated by the Canadian Coast Guard which provides vessel traffic and marine weather information
- Microsoft Certified Technology Specialist (MCTS)
- Middelburg Center for Transatlantic Studies
- Milwaukee County Transit System
- Monte Carlo method, as in Monte
- Multiple Console Time Sharing System
- Munich Center for Technology in Society, an interdisciplinary center at Technische Universität München
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