Mogens Koch (born March 2, 1898 in Frederiksberg, Denmark, died September 16, 1992 in Copenhagen) was a Danish architect and professor at the Royal Danish Academy of Fine Arts 1950-68. He was married to the weaver Ea Koch and father of Hanne Valeur (1929), Søren Koch (1932-2012) and Mogens Svend Koch (1943).

Koch was employed in 1925-32 at the offices of Carl Petersen, Ivar Bentsen and Kaare Klint, where he learned to work with the principles of the Danish functional tradition: respect for the functional requirements of the task, simplicity of design, use of the experience of previous generations and the use of modular units, often based on specific materials.

His works include the extensions to the Agricultural University in Frederiksberg (1945-68 with Steen Eiler Rasmussen), while the Byggereolen (1928) and the Klapstolen (designed in 1932, produced from 1960) are examples of his furniture art. Koch is also known for church restorations. In 1938 he received the Eckersberg Medal, 1938 for the restoration of C.F. Hansen's Haus Baus in Altona, the C.F. Hansen Medal and in 1964 the Carpenters' Guild's annual award.

Koch was made Knight of the Order of the Dannebrog in 1954, Knight of the 1st degree in 1963 and Commander in 1969.