In 1982, the Society became the International Foreign Language Honor Society by installing its first Chapter in a foreign country (Universidad Regiomontana, Monterrey, Mexico).
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PSI became a national society when Beta Chapter was established at The Pennsylvania State University in April 1925.
Sigma Chi | Alpha Phi Alpha | Sigma Xi | Sigma Alpha Epsilon | Omega Psi Phi | Delta Sigma Theta | Phi Kappa Phi | Phi Mu Alpha Sinfonia | Phi Kappa Psi | Phi Delta Theta | Phi Kappa Theta | Alpha Delta Phi | Phi Beta Sigma | Sigma Corporation | Sigma Alpha Mu | Sigma Phi Epsilon | Sigma | Kappa Sigma | Beta Gamma Sigma | Tau Beta Sigma | Six Sigma | Sigma Alpha Iota | Phi Theta Kappa | Phi Sigma Kappa | Phi Life Cypher | Phi Beta Kappa Society | SK Sigma Olomouc | Sigma SD14 | Sigma Gamma Rho | Phi Sigma Epsilon |