Castles in the Air, also known by its working title Orchestra D-2, is a 1919 American silent comedy film, directed by George D. Baker.

It stars May Allison, Ben Wilson, and Clarence Burton, and was released on May 12, 1919.

After he wines and dines her, and makes sexual advances towards her, she finds out that he is married and estranged from his wife.

Fortuna returns to the theater where she orchestrates Pauncefort being seated next to his wife during a show, reuniting the two.

Exhibitors Herald gave the film a lukewarm review, saying that it had a "tendency to drag" and a "pronounced familiarity plot outline", but it did "hold the interest until the finish".