The general public is enthusiastic about astronomy and in particular the research and associated imagery produced by the Hubble Space Telescope (HST). The HST Education and Outreach program (EPO) offers myriad resources for education and also engagement by the public in the research endeavor (hubblesite.org
). One facet of this landscape is the opportunity to participate in Citizen Science projects. There are many flavors of citizen science and those discussed here are focussed on producing research results through the collaboration and activity of volunteer members of the public who conduct tasks that only can be accomplished through human endeavor. This paper touches upon several projects based on HST data and reviews a few others that are derived from the archives at STScI covering several different astrophysics areas.