Marius Müller-Westernhagen (December 6, 1948 in Düsseldorf, North Rhine-Westphalia) is a German actor and musician.

Possibly best known for the maudlin hit "Johnny Walker", Marius Müller-Westernhagen has been a feature in German rock music since the mid-1970s. Marius is known for his energetic public concerts, and his fans know his anthem-like songs by heart.