Karl Albert Buehr (1866–1952) was a painter born in Germany.
Buehr was born in Feuerbach - near Stuttgart. He was the son of Frederick Buehr and Henrietta Doh (Dohna?). He moved to Chicago with his parents and siblings in the 1880s. In Chicago, young Karl worked at various jobs until he was employed by a lithograph company near the Art Institute of Chicago. Introduced to art at work, Karl paid regular visits to the Art Institute, where he found part-time employment, enabling him to enroll in night classes. Later, working at the Institute as a night watchman, he had a unique opportunity to study the masters and actually posted sketchings that blended in favorably with student's work. Having studied under John H. Vanderpoel, Buehr graduated with honors, while his work aroused such admiration that he was offered a teaching post there, which he maintained for many years thereafter. He graduated from the Art Inst. of Chicago and served in the IL Cav in the Spanish–American War. Mary Hess became Karl's wife—she was a student of his and an accomplished artist in her own right. In 1922, he was elected into the National Academy of Design as an Associate member.