Kappa Delta Rho (ΚΔΡ), commonly known as KDR, is an American collegiate social fraternity that was established at Middlebury College in 1905.

The ten principal founders are George Edwin Kimball, Irving Thurston Coates, John Beecher, Pierce Wordsworth Darrow, Thomas Howard Bartley, Benjamin Edward Farr, Gideon Russell Norton, Gino Arturo Ratti, Chester Monroe Walch and Roy Dyer Wood.

[3][1] In the fraternity's first year, founders Kimball, Walch, and Ratti met by committee to draft the ritual, open motto, and constitution.

[1] Growth continued after World War II, when chapters that had briefly ceased operations reopened to returning students, and expansion again became possible.

Similarly, after World War II, the fraternity successfully reopened to the flood of returning GIs fifteen of its then twenty chapters in the fall of 1946.

[1] Unusual among college fraternities, KDR's Alpha chapter at Middlebury chose to coeducate or accept both male and female members in 1989, due to a policy at the school against single-sex organizations.

The fraternity's badge is gold and set in pearls, in the form of the Greek letters Κ and Ρ, with Δ on top.

[1] The National Office of the fraternity publishes a semi-annual news magazine called the Quill & Scroll.

Today, articles in The Quill and Scroll detail the successes of the National Fraternity, the various alumni corporations, undergraduate chapters, and individual members.

In addition, qualified Alumni may be inducted into the prestigious Ordo Honoris based upon achievements in either their career, community, or their dedication to the fraternity.

The Foundation raises funds from Brothers, family, and friends of KDR to financially support the educational, leadership, and character development programs undertaken by the National Fraternity.

The Kappa Delta Rho Foundation provides competitive scholarships based on academic achievement, as well as financial need.

The Academy allows undergraduate KDR brothers to learn more about being an effective leader in their Chapter and the professional world.

Brothers who were admitted to the program through an application process took part in a multi-day hike that was led by an alumni mentor and experienced guide.

This innovative four-year personal development track grounded in the Fraternity's values combines the latest educational technology with a holistic personal development curriculum to mold Brothers from the first day of new member education to prepare them for life after graduation.

[8] In 2015, the KDR chapter at Pennsylvania State University was suspended for three years after their private Facebook page that showed naked women who appeared to be sleeping, passed out, or otherwise incapacitated, apparently without the subjects' consent.

A student claimed that as a pledge, he was burned with cigarettes, physically beaten, and forced to drink liquor mixed with urine and hot sauce.