The knockout stage of the 2025 FIFA Arab Cup was the second and final stage of the competition, following the group stage. It began on 11 December with the quarter-finals and ended on 18 December with the final match at the Lusail Stadium in Lusail. The top two teams from each group (8 in total) advanced to the knockout stage to compete in a single-elimination style tournament. A third place play-off was scheduled to be played between the two losing teams of the semi-finals.
All times are local, AST ().
The top two highest-placing teams from each of the two groups advanced to the knockout stage.
<section begin="Bracket" /><section end="Bracket" />
<section begin=QF1 /> <section end="QF1" />
<section begin=QF2 /> <section end="QF2" />
<section begin=QF3 /> <section end="QF3" />
<section begin=QF4 /> <section end="QF4" />
<section begin=SF1 /> <section end="SF1" />
<section begin=SF2 /> <section end="SF2" />
<section begin=tp /> <section end="tp" />