Bare with me, this is a long list
History of Iowa State's Greeks
Delta Tau Delta, 1875-1894, not sure when they started again (now active)
Pi Beta Phi, 1877-1891, 1906
Delta Delta Delta, 1889-1891, 1912
Phi Gamma Delta, 1907
Sigma Nu, 1904-1998
Sigma Alpha Epsilon, 1905
Beta Theta Pi, 1905
Adelante (local), 1907
Alpha Tau Omega, 1908
Kappa Delta, 1908
Kappa Sigma, 1908
Theta Xi, 1909
Acacia, 1909-1992, 1999
Phi Sigma Kappa, 1911-1939
Pi Kappa Alpha, 1913-1995, 1998
Phi Delta Theta, 1913
Phi Kappa Psi, 1913-1999
Alpha Gamma Rho, 1914
Tau Kappa Epsilon, 1915
Sigma Phi Epsilon, 1916
Sigma Chi, 1916
Lambda Chi Alpha, 1917
Alpha Gamma Delta, 1917
Gamma Phi Beta, 1918
Theta Delta Chi, 1919
Alpha Sigma Phi, 1920-?, 1996
Sigma Kappa, 1921
Chi Phi, 1922-1974
Sigma Pi, 1922-1943, 1992
Chi Omega, 1922
Theta Chi, 1922
Delta Chi, 1923-2001
Phi Kappa Theta, 1924
Phi Omega Pi, 1924-1934
Zeta Tau Alpha, 1926-1939, 1970-1998
Farmhouse, 1927
Delta Sigma Phi, 1927
Phi Kappa Tau, 1928-1999
Pi Kappa Phi, 1929
Delta Zeta, 1931
Alpha Chi Rho, 1932-1972
Kappa Kappa Gamma, 1946
Alpha Phi Alpha Fraternity, Inc., 1947
Kappa Alpha Theta, 1948
Beta Sigma Psi, 1949
Alpha Kappa Lambda, 1961
Alpha Chi Omega, 1961
Triangle, 1964
Alpha Omicron Pi, 1968
Alpha Xi Delta, 1969
Alpha Phi, 1977-1998
Omega Psi Phi Fraternity, Inc., 1977
Sigma Gamma Rho Sorority, Inc., 1982
Kappa Alpha Psi Fraternity, Inc., 1984
Phi Beta Sigma Fraternity, Inc., 1984
Zeta Phi Beta Sorority, Inc., 1988
Sigma Lambda Beta, 1993-2000
Sigma Tau Gamma, 1993-1994
Phi Beta Chi, 1994
Alpha Kappa Alpha Sorority, Inc., 1996-1999
Delta Sigma Theta Sorority, Inc., 1996
GO GREEK