- C4L stands for Connexions 4 London (UK colocation and internet service provider)
- C4L stands for Communities for Learning
- C4L stands for Center for Learning (est. 1999; Irvine, CA)
- C4L stands for Customer for Life
- C4L stands for Lowveld Centre for Lifelong Learning (Canada)
- C4L stands for Command, Control, Communications & Computer Systems Division Long Missile
- C4L stands for Campaign 4 Liberty
C4L