Peter Sekaer (born Peter Ingemann Sekjær 1901 - 1950) was a Danish-American photographer and artist.
Born in Copenhagen, Denmark, Sekaer came to New York in 1918 to seek freedom and opportunity. By 1922 he had a reputation as a master sign painter and had his own successful business producing posters. Several years later he began to take classes at The Art Student's League. Sekaer soon became acquainted with Ben Shahn, who may have been the one to introduce him to photography and who later introduced him to Walker Evans. After 1933, he devoted himself exclusively to photography, studying with Berenice Abbott at the New School for Social Research, and assisting Walker Evans on the project of photographing The Museum of Modern Art's African sculpture collection.
From 1936 to 1942 Sekaer became a professional photographer and was hired by the federal government agency, the Rural Electrification Administration (REA), and later became the head of the REA's graphic department.