Charles Alexandre de Croÿ (1574–1624), Marquis of Havré, Count of Fontenoy, Knight of the Golden Fleece, was a military commander and memoirist from the Habsburg Netherlands and a murder victim.

In 1601 he became captain of an elite cavalry company serving in the Siege of Ostend, and in 1602 commandant of the fifteen Bandes d'ordonnance.

He spent eleven months as a hostage of the mutineers during the Mutiny of Hoogstraten, during which time he started to write his memoirs, which were eventually published posthumously in 1642.

At the outbreak of the Thirty Years' War he was seconded to the imperial army and served in the Battle of White Mountain, but in 1624 he retired from military service to take up a position in civilian administration.

[1] On the evening of 9 November 1624 he was shot through a window of his house in Brussels, dying of his injuries the following day, after receiving medical and spiritual aid in his final hours.