Early Penn fraternities, in order of their appearance at Penn:
- Delta Phi (St. Elmo), 1849
- Zeta Psi, 1850
- Phi Kappa Sigma, 1850
- Delta Psi (St. Anthony Hall), 1854
- Sigma Chi, 1875
- Phi Kappa Psi, 1877
- Delta Beta Phi, 1879
- Beta Theta Pi, 1880
- Alpha Tau Omega, 1881
- Phi Gamma Delta, 1881
- Chi Phi, [1877?] 1883
- Phi Delta Theta, 1883
- Delta Upsilon, 1888
- Phi Delta Phi, 1888
- Phi Alpha Sigma, 1890
- Psi Upsilon, 1891
- Alpha Mu Pi Omega, 1891
- Kappa Alpha Society, 1913
- Alpha Sigma Phi, 1914