The co-vice captain, who signed on until 2028 last year, will now stay in the maroon, blue and gold for a further two seasons.
Brisbane Lions AFLW senior coach Craig Starcevich welcomed Dawes’ extension.
"We’re thrilled to have Belle committed to the Brisbane Lions for another four seasons," Starcevich said.
"In her eight seasons so far, Belle has played in 17 finals, is a dual Premiership Player, an All-Australian, and was our B&F winner last year after being runner up in '23 and '24. It's an amazing football resume for a player so early in her career.
"The energy our fans see from Belle on game day is what she brings to the club every training day throughout our season.
"She has developed into an outstanding leader and is always looking for opportunities to grow as a player and person. We're so grateful to have her for another four seasons as she's such an inspirational role model for her teammates."
Dawes said she was thrilled to commit her future to the club.
"I love being a Lion and I'm so excited for the future. We have some great youngsters coming through, and the club is just an amazing place to be," Dawes said.
"I love playing alongside the girls and really value the coaching and support staff we have at the club.
"Despite not making finals this year, we’ve had so much growth, both as individuals and as a collective. I can’t wait to take that into the pre-season and the seasons to come. Bring on the next four years!”
"I’m excited to play some great footy and keep growing over the next four seasons."