Geisel

Geisel may refer to:


 * Ernesto Geisel (1907–1996), Brazilian military general and politician
 * Orlando Geisel (1905–1979), Brazilian general and Minister of the Army, Ernesto's brother
 * Dr. Seuss, pen name of Theodor Seuss Geisel (1904–1991), a children's book author
 * Theo Geisel (physicist) (born 1948), German physicist
 * Geisel (river), Saxony-Anhalt, Germany
 * Geisel valley, the valley of the river Geisel
 * Geisel Library, the main library building at the University of California San Diego, named after Dr. Seuss