Hatice Muazzez Sultan (Ottoman Turkish: خدیجہ معزز سلطان, "respectful lady" and "precious"; died 12 September 1687) was the second Haseki Sultan of Sultan Ibrahim (İkinci Haseki Sultan) and the mother of Sultan Ahmed II.

Muazzez entered in Ibrahim's harem around 1640, became his concubine, and between 2 January and 15 April 1542 she was entitled second Haseki Sultan, and gave birth to her only certain son, Şehzade Ahmed (future Ahmed II) on 25 February 1643. During Ibrahim's reign, she received a stipend of 1000 aspers a day. She was the most beautiful of all Ibrahim's concubine and she was known for her mild character and her good manners in the palace.

After the deposition and death of Sultan Ibrahim in 1648, his eldest son, Sultan Mehmed IV, son of Turhan Sultan, ascended the throne, after which Muazzez settled in the Old Palace. This brought her thirty eight years of imprisonment in the Old Palace and separation from her son, who was closed in the Kafes.

In 1687, a large fire broke out near the Old Palace. By the next evening the fire had engulfed the Old Palace. The fire burned for five hours and the palace burned down in many places. Most of lives of people in the Old Palace were saved by the servants in the palace. Muazzez was so burned from the fire that she died the next day. Her body was taken to Üsküdar, and was buried near a palace around there. Thus, she was not Valide sultan to her son because she died four years before Ahmed II's accession to the throne.

Wares belonging to Muazzez, were immediately placed in the imperial treasury. Her jewelry was given to Behzad Kadın, Süğlün Kadın, and Șehsuvar Kadın, consorts of the new Sultan Suleiman II. But when her son ascended the throne in 1691, he took away the jewelry from the consorts of the recently deceased Sultan, and placed the jewelry in the imperial treasury.

Together with Ibrahim, Muazzez had only a certain son:

It is not known for sure if she had other children, but according to some^[who?] she was also the mother of: