Tikal Temple II (or the Temple of the Masks, alternatively labelled by archaeologists as Tikal Structure 5D-2) is a Mesoamerican pyramid at the Maya archaeological site of Tikal in the Petén Department of northern Guatemala. The temple was built in the Late Classic Period in a style reminiscent of the Early Classic. Temple II is located on the west side of the Great Plaza, opposite Temple I. Temple II was built by the king Jasaw Chan K'awiil I in honour of his wife, Lady Kalajuun Une' Mo'. Temple II had a single wooden sculpted lintel that bears the portrait of a royal woman who may have been the wife of Jasaw Chan K'awiil I, who was entombed beneath Temple I. Lady Kalajuun Une' Mo', whose name means "Twelve Macaw Tails", was also important for being the mother of Jasaw Chan K'awill I's heir. In fact her son Yik'in Chan K'awiil oversaw the completion of Temple II when he became king.
Temple II was visited by Modesto Méndez, the governor of Petén, in 1848 on the first expedition to the ruins. Preliminary excavations of Temple II started in 1958. On 21 December 2012, more than 7,000 tourists visited Tikal to celebrate the 2012 phenomenon and the supposed end of the world. Many of these tourists climbed the stairs of the pyramid, causing reported damages.
The pyramid is a squat, massive structure dating to the 8th century AD. Today it stands 38 metres (125 ft) high and is the most thoroughly restored of the major temples at Tikal. Its original height would have been closer to 42 metres (138 ft) including its roof comb. The main stairway is 10.4 metres (34 ft) wide and projects 7.45 metres (24.4 ft) from the pyramid base. The base of the pyramid measures 37.6 by 41 metres (123 by 135 ft), covering a surface area of 1,542 square metres (16,600 sq ft). Excavations inside Temple II failed to discover Lady Kalajuun Une' Mo's tomb. Ancient graffiti within the temple shrine depicts a captive upon a platform and bound between two poles being sacrificed with an arrow or a spear. Further ancient graffiti includes images of temples. Some of this graffiti dates to the Classic Period, although other examples appear to date to the Early Postclassic. The interior walls have also been defaced with modern graffiti. Evidence of ritual use in the Postclassic Period was found within the temple shrine, including burials and offerings.