Litmus or litmus test may refer to:

• Litmus test (chemistry), a common pH test
• Litmus (Mozilla), a test case management tool maintained by Mozilla
• "Litmus" (Battlestar Galactica), an episode in the first season of the Battlestar Galactica television series
• Litmus (software), a WebDAV server protocol compliance test suite
• Litmus Test of Medjugorje, a test of ecclesiastical obedience on part of the seers and the apparition of Medjugorje
• Litmus test (language), an English colloquialism:
  • Any kind of social indicator used to classify someone either favorably or unfavorably
  • Litmus test (politics), a question asked of a potential candidate

This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.