On 30 June 2013, AS Monaco announced they had signed Martial to a three-year contract for a fee of €5 million plus bonuses.
On 24 November, he made his first league appearance for the club at the age of 17, replacing Radamel Falcao after 63 minutes and playing a part in Mounir Obbadi's goal which gave victory away to FC Nantes.
He scored his first goal for the principality club on his first start, a 2–0 win over Rennes at the Stade Louis II six days later.
His campaign was disrupted by a sprained ankle against Valenciennes in December.
On 27 January 2014, he extended his contract until June 2018.

In his second season at Monaco, Martial scored nine goals in 36 Ligue 1 games, starting on 5 October 2014 when as a substitute for Lucas Ocampos, he gained a 1–1 draw at reigning champions Paris Saint-Germain with a last-minute strike from close range.
He scored twice against a 10-man Bastia on 13 March 2015 in a 3–0 home victory.
On 26 June, he further extended his link with the team until 2019.

On 4 August 2015, Martial scored his first goal in European competition, in a 4–0 home win over BSC Young Boys in the third qualifying round of the UEFA Champions League; Monaco advanced 7–1 on aggregate.
On 30 June 2013, AS Monaco announced they had signed Martial to a three-year contract for a fee of €5 million plus bonuses. On 24 November, he made his first league appearance for the club at the age of 17, replacing Radamel Falcao after 63 minutes and playing a part in Mounir Obbadi's goal which gave victory away to FC Nantes. He scored his first goal for the principality club on his first start, a 2–0 win over Rennes at the Stade Louis II six days later. His campaign was disrupted by a sprained ankle against Valenciennes in December. On 27 January 2014, he extended his contract until June 2018.
In his second season at Monaco, Martial scored nine goals in 36 Ligue 1 games, starting on 5 October 2014 when as a substitute for Lucas Ocampos, he gained a 1–1 draw at reigning champions Paris Saint-Germain with a last-minute strike from close range. He scored twice against a 10-man Bastia on 13 March 2015 in a 3–0 home victory. On 26 June, he further extended his link with the team until 2019.
On 4 August 2015, Martial scored his first goal in European competition, in a 4–0 home win over BSC Young Boys in the third qualifying round of the UEFA Champions League; Monaco advanced 7–1 on aggregate.
Anthony Martial