Rolf Loer (born Lawrence F. Koehler; 19 January 1892 – 12 October 1964) was an American film actor of the silent era whose career was most prominent in German cinema.

Loer was also a violinist who, later in his career, performed with the Minneapolis Symphony Orchestra.

He was born January 19, 1892, in Minneapolis, Minnesota, as Lawrence F. Koehler to German immigrant parents Friedrich Ernst Georg Koehler, a musician and conductor, and the former Magdalena Obert.

Showing promise in the violin, his father sent him to Germany to study at the Klindworth-Scharwenka Conservatory under the guidance of Arrigio Serato in 1909.

He first played as violinist at the Minneapolis Symphony Orchestra, then moved to New York City, where he gave private lessons.