The Wissenschaftliche Katholische Studentenverein Unitas Stolzenfels is a scientific Catholic student association at the University of Bonn in Germany.

It It is a member of the Unitas-Verband (UV) an umbrella organization of several German Catholic fraternities and sororities.

World War I prevented a fast buildup of the Aktivitas (the active student association).

Before fraternities were banned by the national socialists, each of the associations in Bonn had 50 to 40 active members.

Once again Hermann-Josef Stumpe, now pastor of the Bonn minister, and bank director Dr. Karl Loskant were founding members.

Official affiliation followed on 4 August 1950, during the 73rd general assembly (Generalversammlung, GV) in Munich.

The house was inaugurated during the 95th GV in Bonn in 1972 by the nuncio in Germany, Archbishop Corrado Bafile.

As a sign of membership, a needle is affixed to the collar of every new member at their official reception into the fraternity.