Sigma Iota Epsilon (ΣΙΕ) is an American national honorary and professional management fraternity.

[4] The fraternity's letters, ΣΙΕ, represent Sproude or ''Earnestness'', Idreia or ''Knowledge'', and Exoche or ''Excellence''.

The Sigma Iota Epsilon emblem is a rectangular gold key, with the letters ΣΙΕ in red arranged diagonally from the upper left to the lower right.

[1] In the lower-left corner is a diagram of a functional organization, as developed by Frederick Winslow Taylor; this symbolizes management techniques.

[5] To be eligible to join, undergraduate students must have at least a 3.25 GPA, received a B or better in at least one management course, and completed one year of college or thirty semester hours at an institution with a chapter.