The official language of Delhi Sultanate was:
The official language of Delhi Sultanate was:
دہلی سلطنت کی سرکاری زبان کیا تھی
Explanation
Persian, also known by its endonym Farsi, or "Parsi".
It is primarily spoken in Iran, Afghanistan, and Tajikistan, and some other regions which historically were Persianate societies.
Persian was also declared as the official language of Mughals by Akbar.