Iain De Caestecker's partner is Hayley Atwell, an English actress best known for her role as Peggy Carter in the Marvel Cinematic Universe. The couple have been in a relationship since 2017 and are both successful actors in their own right. They are a private couple who have kept their relationship out of the spotlight, but they often attend events together and are supportive of each other's careers.
The relationship between De Caestecker and Atwell is a reminder that love can blossom anywhere, even between two people from different countries. It is also a reminder that it is possible to have a successful career and a happy personal life.
