“A Foggy Day” is a popular song composed by George Gershwin, with lyrics by Ira Gershwin. The song was introduced by Fred Astaire in the 1937 film A Damsel in Distress. It was originally titled “A Foggy Day (In London Town)” in reference to the pollution-induced pea soup fogs that were common in London during that period, and is often still referred to by the full title.