ICW can refer to:
- International Clan War
- Intracoastal Waterway
- International Council of Women
- International Championship Wrestling, a now-defunct wrestling promotion based in Lexington, Kentucky
- International Championship Wrestling, a now-defunct New England-based wrestling promotion
- International Community of Women Living with HIV/AIDS
- International Confederation of Wizards
- Internet call waiting, a technology that allows a telephone line to accept incoming calls while connected to a dialup connection
- Integrated constructed wetland