The club has exercised an option to extend Richard Chin's contract until the summer of 2024.
The 20-year-old academy graduate, who joined the Addicks at U9 level and captained the club's U18s side, has earned 15 appearances for the first team so far this season.
Chin made his senior Charlton debut in a Papa John's Trophy tie at Leyton Orient in November 2021.
Manager Dean Holden said: "We had an option for an extra year with Richard. He's a good, young player with a bright future ahead of him, so I’m pleased we’ve got him for another year.
"As well as his physical and technical attributes, he’s impressed me with his work rate and his focus on developing his game.
"Richard is only 20 and in his first full year as a senior player, so I’m looking forward to watching him develop as there is plenty more to come from him."
Academy Director Steve Avory added: "I'm delighted for Richard. This has been a really progressive season at senior level for him.
"The most notable performance against Brighton was proof for me that he can go on to have a career in the game.
"He's a highly dedicated individual, who always wants to improve and seek a gain to his performance level. He's a role model to our younger players that hard work, not just talent, will get you there."
The Addicks return to The Valley on Saturday to take on Wycombe Wanderers (3pm KO GMT). Click here to purchase your tickets.
Charlton fans can support the academy by signing up to the Valley Gold scheme. Valley Gold enables fans to support the club’s academy in unearthing the talents of tomorrow, as well as giving them the chance to win cash prizes.