From Bochum Hauptbahnhof (Central Station) take the U35 towards Bochum Querenburg (Hustadt) and get out at stop "Ruhr-Universität". (Ticket needed: Preisstufe A).
On weekdays the subway U35 leaves every 5 minutes and reaches the university within 9 minutes.

Overview of public transport:

• Subway U35 Ruhr-University <--> Schloß Strünkede (Herne) via Bochum Central Station
• Schnellbus SB67 Ruhr-University <--> Wuppertal Central Station via Sprockhövel (every hour)
• Bus 320 Ruhr-University <--> Witten (every 20 min)
• Bus 339 Ruhr-University <--> Witten-Center (every hour)
• Bus 346 Ruhr-University <--> Bochum-Oberdahlhausen (every 20 min)
• Bus 370 Ruhr-University <--> S-Bahnhof Dortmund Lütgendortmund via BO-Langendreer (every hour)
• Bus 377 Ruhr-University <--> BO-Langendreer Nord/S-Bahn (every 20 min)