CIP
- Alex Epstein (American writer)
- CIP-Tool
- Cahn–Ingold–Prelog priority rules
- Calf-intestinal alkaline phosphatase
- California Innocence Project
- Canadian Institute of Planners
- Capital improvement plan
- Carbon in pulp
- Cataloging in Publication
- Center for Intellectual Property Studies
- Center for International Policy
- Center for Islamic Pluralism
- Centre for Integrated Photonics
- Centro Internacional de la Papa
- Certified IRB Professional
- Citizen Information Project
- Classification of Instructional Programs
- Clean-in-place
- Combat Identification Panel
- Comitato Italiano Paralimpico
- Commercial Import Program
- Commercially Important Person
- Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives
- Common Indexing Protocol
- Common Industrial Protocol
- Competitiveness and Innovation Framework Programme
- Congenital insensitivity to pain
- Construction in progress
- Continual improvement process
- Continuing patent application
- Core Independent Peripherals
- Corps of Intelligence Police
- Crippled Intellect Publications
- Critical Infrastructure Protection
- Critical illness polyneuropathy
- Crown International Pictures
- Customer Identification Program
- Cyclin-dependent kinase inhibitor proteins
- Incoterms
- Powder metallurgy
- Ship Characteristics Board