Sigma Phi Alpha (ΣΦΑ) is a national honorary society for women in the field of dental hygiene.

[1] Its purpose is to promote, recognize, and honor scholarship of students in oral or dental hygiene schools.

[1] Chapters can only be chartered at schools with a dental hygiene program and membership must be in the upper twenty percent of their class.

[1] The society became international with the installation of Delta Eta chapter at the University of Manitoba in Winnipeg, Canada.

Sigma Phi Alpha and Omicron Kappa Upsilon, an honorary society for dentistry, organize a joint symposium every other year at the American Dental Education Association annual meetings.