Christopher Markus (born October 16, 1969) and Stephen McFeely (born February 24, 1970) are American screenwriters and producers. McFeely and Markus were the second and the third most successful screenwriters of all time in terms of U.S. box office receipts with a shared total gross of over $3.1 billion. However, in overall, they are the highest grossing screenwriters altogether in terms of worldwide box office with the total gross of $9.3 billion.

They gained worldwide recognition for their works that include The Chronicles of Narnia film franchise and the Marvel Cinematic Universe (MCU), having written the first three Captain America films (The First Avenger, The Winter Soldier and Civil War), in addition to Thor: The Dark World, Avengers: Infinity War, and Avengers: Endgame, which is currently the second highest-grossing film of all time unadjusted for inflation. They also created ABC's Agent Carter TV series, set in the MCU.