Ian Stuart Callum (born 30 July 1954) is a British car designer who has worked for Ford, TWR, and Aston Martin.

From 1979 to 1990 Callum designed for Ford, working between Dunton, Japan, Italy and Australia, mainly on "bits of cars, mostly steering wheels".

[2] As well as working on bread-and-butter Fiestas and Mondeos, he contributed to image builders such as the RS200 and Escort RS Cosworth, the last of which he is especially proud of and with which he collaborated with fellow RCA graduate Peter Horbury.

After eleven years in a corporate environment, Callum left Ford in 1990 to join Peter Stevens and Tom Walkinshaw to form TWR Design.

In an interview with Car and Driver in 2010, when asked how much of the DB9 and V8 Vantage were designed under his watch, Callum replies "The DB9, I’d say pretty much 100 percent, including the interior.

[5] At Jaguar, since the Lawson designed 2001 X-Type and 2002 XJ were well advanced his influence was initially felt through a series of concepts, the 2001 R-Coupe and 2003 R-D6.

This began with the second generation, 2006 XK, which bears striking similarity to the Aston Martin DB9, which Callum describes as being a result of modern safety legislation.

"Designing Jaguar cars was a lifelong dream for me, and I’m delighted to remain involved as a consultant for the brand", he said in an interview.