Plastic Free Seas (PFS) is a Hong Kong-based environmental charity, dedicated to advocating change in the way society views plastics and other single-use materials through education and action campaigns, with a focus on youth in schools. By the end of 2022, they reached almost 100,000 students in more than 280 schools across Hong Kong, in both Cantonese and English.

PFS also engages community and corporate groups to encourage behaviour change through education and beach cleanups.