Hattiesburg Group of the Sierra Club Records

The Sierra Club is an environmental organization. It was founded on May 28, 1892, in San Francisco, California, by the Scottish-American preservationist John Muir, who became its first president.

The Sierra Club is organized on both a national and local level. The club is divided into large chapters representing large geographic areas, some of which have tens of thousands of members. These chapters are divided into regional groups, and special interest sections, committees, and task forces. While much activity is coordinated at a local level, the Club is a unified organization; decisions made at the national level take precedence. Traditionally associated with the progressive movement, the club was one of the first large-scale environmental preservation organizations in the world, and currently engages in lobbying politicians to promote environmentalist policies. Recent focuses of the club include promoting sustainable energy, mitigating global warming, and opposing the use of coal. The club is known for its political endorsements, which are often sought after by candidates in local elections; it generally supports liberal and progressive candidates in elections.

The Sierra Club's stated mission is "To explore, enjoy, and protect the wild places of the earth; To practice and promote the responsible use of the earth's ecosystems and resources; To educate and enlist humanity to protect and restore the quality of the natural and human environment; and to use all lawful means to carry out these objectives."