Josef Albers (/ˈælbərz/ AL-bərz, US also /ˈɑːl-/ AHL-, German: [ˈjoːzɛf ˈʔalbɐs]; March 19, 1888 – March 25, 1976) was a German-born American artist and educator who is considered one of the most influential 20th-century art teachers in the United States. Born in 1888 in Bottrop, Westphalia, Germany, into a Roman Catholic family with a background in craftsmanship, Albers received practical training in diverse skills like engraving glass, plumbing, and wiring during his childhood. He later worked as a schoolteacher from 1908 to 1913 and received his first public commission in 1918 and moved to Munich in 1919.

In 1920, Albers joined the Weimar Bauhaus as a student and became a faculty member in 1922, teaching the principles of handicrafts. With the Bauhaus's move to Dessau in 1925, he was promoted to professor and married Anni Fleischmann, a student at the institution and a textile artist. Albers' work in Dessau included designing furniture and working with glass, collaborating with established artists like Paul Klee. Following the Bauhaus's closure under Nazi orders in 1933, Albers emigrated to the United States, and he taught at the experimental liberal arts institution Black Mountain College in North Carolina until 1949.

At Black Mountain, Albers taught students who would later go on to become prominent artists such as Ruth Asawa and Robert Rauschenberg, and invited contemporary American artists to teach in the summer seminar, including the choreographer Merce Cunningham and Harlem Renaissance painter Jacob Lawrence. In 1950, he left for Yale University to head the design department, contributing significantly to its graphic design program. Albers' teaching methodology, prioritizing practical experience and vision in design, had a profound impact on the development of postwar Western visual art, while his book Interaction of Color, published in 1963, is considered a seminal work on color theory.

In addition to being a teacher, Albers was an active abstract painter and theorist, best known for his series Homage to the Square, in which he explored chromatic interactions with nested squares, meticulously recording the colors used. He also created murals, such as those for the Corning Glass Building and the Time & Life Building in New York City. In 1970, he and his wife lived in Orange, Connecticut, where they continued to work in their private studio. In 1971, Albers was the first living artist to be given a solo show at the Metropolitan Museum of Art in New York. Albers died in his sleep on March 25, 1976, at the Yale New Haven Hospital after being admitted for a possible heart ailment.

Albers was born into a Roman Catholic family of craftsmen in Bottrop, Westphalia, Germany, in 1888. His father, Lorenzo Albers, was variously a housepainter, carpenter, and handyman. His mother came from a family of blacksmiths. His childhood included practical training in engraving glass, plumbing, and wiring, giving Josef versatility and lifelong confidence in the handling and manipulation of diverse materials. He worked from 1908 to 1913 as a schoolteacher in his home town; he also trained as an art teacher at Königliche Kunstschule in Berlin, Germany, from 1913 to 1915. From 1916 to 1919 he began his work as a printmaker at the Kunstgewerbschule in Essen, where he learnt stained-glass making with Dutch artist Johan Thorn Prikker. In 1918 he received his first public commission, Rosa mystica ora pro nobis, a stained-glass window for a church in Bottrop. In 1919 he moved to Munich, Germany, to study at the Königliche Bayerische Akademie der Bildenden Kunst, where he was a pupil of Max Doerner and Franz Stuck.

Albers enrolled as a student in the preliminary course (vorkurs) of Johannes Itten at the Weimar Bauhaus in 1920. Although Albers had studied painting, it was as a maker of stained glass that he joined the faculty of the Bauhaus in 1922, approaching his chosen medium as a component of architecture and as a stand-alone art form. The director and founder of the Bauhaus, Walter Gropius, asked him in 1923 to teach in the preliminary course 'Werklehre' of the department of design to introduce newcomers to the principles of handicrafts, because Albers came from that background and had appropriate practice and knowledge.

In 1925, the year the Bauhaus moved to Dessau, Albers was promoted to professor. At this time, he married Anni Albers (née Fleischmann) who was a student at the institution. His work in Dessau included designing furniture and working with glass. As a younger instructor, he was teaching at the Bauhaus among established artists who included Oskar Schlemmer, Wassily Kandinsky, and Paul Klee. The so-called "form master" Klee taught the formal aspects in the glass workshops where Albers was the "crafts master"; they cooperated for several years.

With the closure of the Bauhaus under Nazi pressure in 1933 the artists dispersed, most leaving the country. Albers emigrated to the United States. The architect Philip Johnson, then a curator at the Museum of Modern Art in New York City, arranged for Albers to be offered a job as head of a new art school, Black Mountain College, in North Carolina. In November 1933, he joined the faculty of the college where he was the head of the painting program until 1949.