Today the term “Greek letter organization” is often synonymous with the terms “fraternity” and “sorority”. Some fraternities and sororities are national, meaning they have chapters at different colleges and universities while others are local and only at specific schools.
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| Acacia (Chapters) | AKAKIA |
| Alpha Gamma Rho (Chapters) | AΓΡ |
| Alpha Gamma Sigma (Chapters) | ΑΓΣ |
| Alpha Delta Gamma (Chapters) | ΑΔΓ |
| Alpha Delta Phi (Chapters) | ΑΔΦ |
| Alpha Epsilon Pi (Chapters) | ΑEΠ |
| Alpha Kappa Lambda (Chapters) | ΑΚΛ |
| Alpha Sigma Phi (Chapters) | ΑΣΦ |
| Alpha Tau Omega | ΑΤΩ |
| Alpha Phi Alpha | AΦA |
| Alpha Phi Delta | AΦΔ |
| Alpha Chi Rho (Chapters) | ΑΧΡ |
| Beta Sigma Psi (Chapters) | BΣΨ |
| Beta Theta Pi (Chapters) | ΒΘΠ |
| Beta Chi Theta (Chapters) | ΒΧΘ |
| Delta Chi (Chapters) | ΔΧ |
| Delta Kappa Epsilon (Chapters) | ΔΚΕ |
| Delta Phi (Chapters) | ΔΦ |
| Delta Psi (Chapters) | ΔΨ |
| Delta Sigma Phi (Chapters) | ΔΣΦ |
| Delta Tau Delta (Chapters) | ΔΤΔ |
| Delta Upsilon (Chapters) | ΔΥ |
| FarmHouse (Chapters) | FH |
| Zeta Beta Tau (Chapters) | ΖΒΤ |
| Zeta Psi (Chapters) | ΖΨ |
| Theta Xi (Chapters) | ΘΞ |
| Theta Chi (Chapters) | ΘΧ |
| Theta Delta Chi (Chapters) | ΘΔΧ |
| Iota Phi Theta | IΦΘ |
| Iota Nu Delta (Chapters) | INΔ |
| Kappa Alpha Order (Chapters) | ΚΑ |
| Kappa Alpha Psi (Chapters) | KAΨ |
| Kappa Alpha Society (Chapters) | ΚΑ |
| Kappa Delta Rho (Chapters) | KΔP |
| Kappa Delta Phi (Chapters) | ΚΔΦ |
| Lambda Theta Phi (Chapters) | ΛΘΦ |
| Lambda Sigma Upsilon (Chapters) | ΛΣΥ |
| Lambda Phi Epsilon (Chapters) | ΛΦΕ |
| Lambda Chi Alpha (Chapters) | ΛΧΑ |
| Nu Alpha Kappa (Chapters) | NAK |
| Pi Kappa Alpha | ΠΚΑ |
| Pi Kappa Phi (Chapters) | ΠΚΦ |
| Pi Lambda Phi (Chapters) | ΠΛΦ |
| Sigma Alpha Epsilon (Chapters) | ΣΑΕ |
| Sigma Alpha Mu (Chapters) | ΣΑΜ |
| Sigma Beta Rho | ΣBP |
| Sigma Lambda Beta (Chapters) | ΣΛB |
| Sigma Nu (Chapters) | ΣN |
| Sigma Pi (Chapters) | ΣΠ |
| Sigma Phi Society | ΣΦ |
| Sigma Phi Delta (Chapters) | ΣΦΔ |
| Sigma Phi Epsilon (Chapters) | ΣΦΕ |
| Sigma Chi (Chapters) | ΣΧ |
| Sigma Tau Gamma (Chapters) | ΣΤΓ |
| Tau Delta Phi | TΔΦ |
| Tau Epsilon Phi (Chapters) | ΤΕΦ |
| Tau Kappa Epsilon (Chapters) | ΤΚΕ |
| Triangle Fraternity (Chapters) | |
| Phi Beta Sigma (Chapters) | ΦBΣ |
| Phi Gamma Delta (Chapters) | FIJI |
| Phi Iota Alpha (Chapters) | ΦΙΑ |
| Phi Kappa Theta (Chapters) | ΦΚΘ |
| Phi Kappa Sigma (Chapters) | ΦΚΣ |
| Phi Kappa Tau (Chapters) | ΦΚΤ |
| Phi Kappa Psi (Chapters) | ΦΚΨ |
| Phi Lambda Chi (Chapters) | ΦΛΧ |
| Phi Mu Delta (Chapters) | ΦΜΔ |
| Phi Sigma Kappa (Chapters) | ΦΣΚ |
| Phi Sigma Phi | ΦΣΦ |
| Chi Phi (Chapters) | ΧΦ |
| Chi Psi (Chapters) | ΧΨ |
| Psi Upsilon (Chapters) | ΨΥ |
| Omega Delta Phi (Chapters) | ΩΔΦ |
| Delta Kappa Epsilon * (Chapters) | ΔΚΕ |
| Kappa Sigma (Chapters) | KΣ |
| Sigma Alpha Epsilon * (Chapters) | ΣΑΕ |
| Sigma Lambda Beta * (Chapters) | ΣΛB |
| Sigma Pi * (Chapters) | ΣΠ |
| Phi Sigma Kappa * (Chapters) | ΦΣΚ |
| Alpha Phi Alpha * | ΑΦΑ |
| Iota Phi Theta * | ΙΦΘ |
| Kappa Alpha Psi * (Chapters) | ΚΑΨ |
| Phi Beta Sigma * (Chapters) | ΦBΣ |
| Omega Psi Phi (Chapters) | ΩΨΦ |
partial list from http://en.wikipedia.org/wiki/List_of_social_fraternities_and_sororities