Ixlu (/iʃˈluː/) is a small Maya archaeological site that dates to the Classic and Postclassic Periods. It is located on the isthmus between the Petén Itzá and Salpetén lakes, in the northern Petén Department of Guatemala. The site was an important port with access to Lake Petén Itzá via the Ixlu River. The site has been identified as Saklamakhal, also spelt Saclemacal, a capital of the Kowoj Maya.

The site has over 150 structures, the majority of which in the site core display typically Postclassic characteristics. The site was briefly investigated by Don and Prudence Rice in 1980.

Ixlu is located approximately 23 km (14 mi) east of the departmental capital of Flores and 275 km (171 mi) north of Guatemala City. Ixlu is approximately 28 km (17 mi) south of the ruins of the major Classic Period city of Tikal.

Archaeological investigations have uncovered potsherds dating as far back as the early Middle Preclassic (1000 BC–800 BC). Postclassic potsherds are widely distributed in the upper levels of the site to a depth of 30 to 40 cm (12 to 16 in). Evidence from the Temple of the Hidden Jars indicates a continuous occupation from the Preclassic right through the Classic (AD 200–900) to the Postclassic Period (AD 900–1525), with occupation continuing until approximately 1700, well after the Spanish Conquest of most of Guatemala, according to ethnohistoric sources. The Petén Lakes region finally fell to the Spanish Crown in 1697, at which time Ixlu was in disputed territory between the mutually hostile Itza and Kowoj kingdoms.

Fifty structures have been mapped at Ixlu by the Central Peten Historical Ecology Project. Nine of these are C-shaped bench superstructures and two are L-shaped.

Ixlu has two ballcourts and is one of only two Postclassic sites in the central Petén lakes region to have a recognisable ballcourt. However, both ballcourts at Ixlu apparently date to the Late Classic. The site possesses a twin pyramid complex, a feature that is rare outside of Tikal and probably indicates the political influence of that great city.

The architecture at Ixlu resembles that at the Late Classic site of Seibal on the Pasión River.

The Temple of the Hidden Jars (Templo de las Vasijas Escondidas) has been labelled as Structure 2034. It is bordered by Structure 2041 on the south side, Structure 2036 to the west and Structure 2035 to the north, its eastern side faces onto Patio B. The temple measures 13.9 by 9.6 metres (46 by 31 ft) and consisted of a two-level platform, the first level was 1.15 metres (3.8 ft) high and the second level had a height of 1.2 metres (3.9 ft). The temple has been dated to the Late Postclassic Period (AD 1200-1525). A stairway ascended the west side of the temple and there was an altar on the summit that measured 1 metre (3.3 ft). The temple is named from two hidden niches on the west side of the temple, one at the foot of the stairway and the second under an altar on the temple steps. Each contained a single red-brown ceramic vessel measuring approximately 16 centimetres (6.3 in) in diameter and 14 centimetres (5.5 in) high, each with its respective concave lid. The vessels have four handles spaced equidistantly around the circumference, with the lids also possessing a handle. The jars contained only brown soil. This style of hidden niche is similar to niches associated with ceremonial structures in distant Mayapan in the north of the Yucatán Peninsula.