Theo Adam (1 August 1926 – 11 January 2019) was a German operatic Bass singer who had an active international career in operas, concerts, and recitals from the 1940s through the 1990s.He particularly excelled in portraying roles from the operas of Richard Wagner.On the concert stage, he was a much admired Bach singer and also drew acclaim for his interpretation of the title character of Felix Mendelssohn's Elijah.