From the shores of Lake Michigan to the forests of the Shawnee, Illinois is a state rich in natural beauty. We are committed to protecting the diversity of our state's natural resources through campaigns on conservation, energy issues, clean water, and transportation.
Volunteer with us, become a member, or donate and help us protect the water, air, land and wildlife in our beautiful state.
For up-to-date news and actions follow us on social media. We're on Twitter, Facebook, and Instagram.
Welcome to the Illinois Chapter of Sierra Club!
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Local News and Information
Illinois Fights Back by Electing New Champs
March 19, 2026
Tuesday was Illinois’ first chance in the voting booth to respond to all that Trump has let loose on our communities and country, and we are heartened by some big wins that bode well for our ability to fight back to protect our environment and our...
Sierra Club Illinois Announces Primary Election Endorsements
February 10, 2026
Sierra Club Illinois Announces Primary Election Endorsements“Leaders Who Will Fight to Protect Our Communities” Contact: Jack Darin, jack.darin@sierraclub.org Illinois -- Today, Sierra Club announced its endorsements in the...
2025 Wins
December 15, 2025
It’s so hard to neatly summarize the year that was 2025. It was the year that our federal government was largely handed over to the fossil fuel industry, resulting in unprecedented attacks on our environmental safeguards and public lands. Our...