Christopher Paul O'Neill, KNO (born 27 June 1974) is a British-American financier and husband of Princess Madeleine, Duchess of Hälsingland and Gästrikland, with whom he has three children.

He grew up in London, St. Gallen, Austria and Germany, and holds dual American and British citizenship.

[3] O'Neill was educated at Eaton House and Westminster Under School in London,[7] Institut auf dem Rosenberg in St. Gallen, Switzerland, and graduated with a BA degree in International Relations from Boston University.

He was a partner and head of research at Noster Capital and former employee of NM Rothschild and Sons and Steinberg Asset Management.

In Autumn 2015, several months after the birth of Prince Nicolas, the entire family moved to London, where O'Neill's business is located.