Below is a list of the officially chartered alumni clubs of Sigma Pi

1897 Alumni Association
Alpha Alumni Association
Beach Cities Alumni Club
Beta Chapter Alumni Club
Beta-Sigma Alumni Association
Cascade Alumni Club
Central Illinois Alumni Association
Central Iowa Alumni Association
Cletus A. Broecker Alumni Club
Delta-Rho Alumni Club
Eta-Nu Alumni Club
Gateway Alumni Association
Grand Rapids Alumni Association
Hawkeye Alumni Club
Jack C. Fields Alumni Club
John H. Williams, Jr. Alumni Club
Kappa of Sigma Pi Alumni Association
Kentucky Thoroughbred Alumni Club
Lonestar Alumni Club
Mountain City Alumni Club
New York City Alumni Club
Niagara Frontier Alumni Association
North Jersey Alumni Club
Orange County Alumni Association
Ozark Alumni Club
Phi of Sigma Pi Alumni Club
Psi Theta Nu Alumni Club
Rancho Dominguez Alumni Club
Rhode Island Alumni Club
River City Alumni Association
Rotunda Alumni Club
Sigma Pi Alumni Association of Arkansas
Sigma Pi Alumni Association of Saginaw
Sigma Pi Columbus Alumni Club
Sigma Pi of Providence Alumni Club
Southern Keystone Alumni
Southern West Virginia Alumni Association
Space Coast Alumni Association
The Sphinx Club
Theta Alumni Association
Theta-Delta Alumni Association
Upper Canada Alumni Association
Upsilon Alumni Association
Western Michigan Alumni Club
Winston-Salem Alumni Club