Sigma Tau Phi (ΣΤΦ) was a historically Jewish fraternity founded in 1918 and which merged into Alpha Epsilon Pi (ΑΕΠ) in 1947.

Sigma Tau Phi was founded at the University of Pennsylvania in 1918.

The fraternity merged with Alpha Epsilon Pi in March 1947.

Of the remaining chapters, AEPi agreed to make efforts to reactivate the chapters at Dickinson and Temple but not the one at NYU as there was an active AEPi group there at the time.

[2] In addition, the Sigma Tau Phi Alumni Clubs in Wilmington, Delaware and Cincinnati Ohio were granted charters with Alpha Epsilon Pi.