The Q9's interior is built around space as its central asset. Audi has expanded the material palette for this model, offering Dinamica microfibre, leather and leatherette, and Fine Nappa leather depending on the configuration. Inlay and trim options include fine grain ash natural, lime structure natural, silk beige, and carbon fibre weave with basalt grey accents. High-gloss surfaces are largely absent; matte and textured finishes take their place throughout the cabin, reducing fingerprints and maintaining a refined, low-maintenance look. New exterior-inspired interior colour choices tamarind brown and stone beige add to the range. Front seat occupants can opt for the available sports seat plus, which includes ventilation and massage functions.
The Q9 is offered in two seating configurations. The six-seat layout includes two electrically adjustable captain's chairs in the second row, oriented toward business-class comfort. The seven-seat layout fills the second row with three positions, all compatible with child safety seats a practical feature for families. Standard across both: partial power adjustment for all seats. Third-row access is simplified by an outer second-row seat that slides and tilts forward electrically without folding, so child seats installed there don't need to be removed first. Comfort entry can be activated through the MMI or a button near the rear door. Third-row seatbacks fold individually by electric control, allowing quick transitions between passenger and cargo configurations.