- Cake decorating
- Canal walking
- Cantonese
- Career coaching
- Cello lessons
- Chair yoga
- Challenging teenagers
- Charity and board governance
- Chemistry lessons
- Cinema 4D
- Cinema trips
- Cleaning
- Climbing buddy
- Climbing buddy/tips on getting started
- Coaching (helping develop ideas/being a soundboard)
- Coaching/mentoring
- Community knitting/crafting
- Community work
- Companion to help to sort out excess house/personal stuff and put it up for sale online and\or to give as charity donations
- Company
- Computer programming/ website programming work/tuition
- Conversation
- Conversation - history, graveyards, current affairs, movies, science, spirituality, veganism, LGBT, politics, psychology, ethical living
- Conversation - history, law, politics, poetry
- Conversation about sustainable living
- Cooking
- Cooking healthy meals
- Cooking lessons/sharing cooking skills
- Cooking techniques and advice
- Course fishing
- Craft lessons
- Crafting
- Creating vision boards
- Creative doodling
- Creative furniture restoration
- Creative thinking time/conversation
- Creative writing
- Crochet
- Crochet/how to follow crochet patterns
- Curating music playlists
- CV help
- CV help
- Cycling advice
- Cycling/cycling touring and riding
