Alexandra Mackenzie Pfeiffer (born November 26, 2007) is an American professional soccer player who plays as a forward for the Kansas City Current of the National Women's Soccer League (NWSL).

She played youth soccer for St. Louis Scott Gallagher of the Elite Clubs National League (ECNL), winning under-16 national club title in 2022.

[1] Pfeiffer signed a three-year contract with the Kansas City Current through the NWSL Under-18 Entry Mechanism on October 30, 2023, at 15 years and 338 days old, becoming the fourth-youngest signing in NWSL history.

[3] In a match against the Houston Dash on June 28, Pfeiffer tore her ACL and meniscus in the second half, ending her rookie season[4] and making her unable to compete at the 2024 FIFA U-17 Women's World Cup.

This biographical article related to women's soccer in the United States is a stub.