Brandau may refer to:

• Brandau, district in Modautal
• Brandau (surname)
• Brandau Crater, volcano
• Brandau Glacier, glacier
• Brandau Rocks, rock formation

• Second-row (rugby league)
• Second Ruijs de Beerenbrouck cabinet
• Second Russo-Japanese War
• Second Rutte Cabinet
• Second Saint John Pond
• Second Saint Marcellus' flood
• Second Saint Siloam Missionary Baptist Church
• Second Salmond government
• Second Salmond ministry
• Seconds (angle)
• Second Schmalkadic War
• Second Schmalkaldic War
• Second Schober government
• Second School of Fontainebleau
• Second School of Paris
• Second Schussel government
• Second Scottish independence referendum
• Second Sea Lord and Chief of Naval Personnel
• Second Sea Lord and Chief of Naval Personnel and Training
• Second Sea Lord and Commander-in-Chief Naval Home Command
• Second Sea Lord and Deputy Chief of Naval Staff
• Second Secretary to the Admiralty
• Second Serbian Volunteer Division
• Second Service Command
• Second Serzh Sargsyan government