Jetro Willems (born 30 March 1994) is a Dutch footballer who plays as a left-back for Bundesliga club Eintracht Frankfurt. He represented the Netherlands national team at UEFA Euro 2012; he played in the Netherlands' opening match of the tournament at the age of 18 years and 71 days, making him the youngest player ever to play in the UEFA European Championship.
Willems began his career with amateur side Spartaan '20 from whom he joined Sparta Rotterdam. During his time with Sparta he progressed through the club's youth academy and made his senior debut on 16 January 2011, in a match against Go Ahead Eagles. He made 16 appearances in the Dutch second division.
On 31 August 2011, Willems joined PSV Eindhoven on a three-year contract. He received the number 43 jersey and made his PSV debut on 23 October in a match against Vitesse. Willems became the youngest Dutchman to play in a UEFA competition when he started against Hapoel Tel Aviv on 3 November in a UEFA Europa League group stage match. That same month, he was permanently promoted to the first team squad.