The 2026–27 UEFA Nations League B features 16 teams across four groups of four, with each side playing a home-and-away round-robin over six matchdays from late September through November 2026. The four group winners earn direct promotion to League A for the following edition, while runners-up enter promotion play-offs against League A sides. Recent roster movements include Scotland, Hungary, Poland, Israel, Switzerland, and Bosnia and Herzegovina dropping from League A, offset by Kosovo, North Macedonia, Northern Ireland, Romania, and Sweden rising from League C. Fixtures begin September 24 with opening ties such as Slovenia versus Scotland and Austria versus Israel, making early results and squad availability critical ahead of the condensed autumn schedule.