Alpha Chi Omega is a collegiate women's fraternity established at DePauw University in 1885. When naming its collegiate chapters, after the first series, the new series drop one or more corresponding letter sets from the list of available names in this manner: In the "Alpha Alpha" series, there is no Alpha Alpha chapter; the name is unused. In the "Beta Alpha" series, there is neither a Beta Alpha chapter nor a Beta Beta chapter, and so on. Thus, the list of available collegiate chapter names shrinks by one more potential name each time a new series is cycled. The first 26 skipped names were assigned to the first 26 alumnae chapters. After Zeta Zeta, alumnae chapters are named in the same fashion as collegiate chapters, with the first letter repeated (Alpha Beta Alpha, Alpha Gamma Alpha, and so on).
Alumnae chapters In the following list of Alpha Chi Omega alumnae chapters, active chapters are indicated in bold and inactive chapters are in italics.