The 23rd Inter-School Debate Competition (IDC) 2026 is a national-level school debate tournament organised by the International Islamic University Malaysia (IIUM) through the IIUM World Debate and Oratory Centre (IWON).

The competition features three language categories: Malay, English, and Arabic. The preliminary rounds will be conducted online via Zoom from 17–19 July 2026, followed by the quarter-finals and final rounds held physically at IIUM Gombak Campus from 7–10 August 2026.

The competition welcomes secondary school students from Form 1 to Form 5, with teams competing under the respective debate formats for each language category.