Marius Müller-Westernhagen (born 6 December 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. Though written a few years earlier, his song "Freiheit" ("Freedom") is widely considered as an anthem of the German Reunification.
While keeping away from the merely fashionable, Marius has nevertheless managed to reinvent himself every few years, and is popular with multiple generations of Germans. As a result of his singing which almost exclusively in German language in a country where pop and rock are primarily performed in English, Westernhagen originally seemed destined for obscurity, but has managed to use this to his advantage, defining himself as a durable alternative to the perceivably manufactured English-language hits of America and the UK.
Müller-Westernhagen has also acted in films and in radio.