Monte d'Accoddi is a Neolithic archaeological site in northern Sardinia, located in the territory of Sassari, Italy.

The original structure was built by the Ozieri culture or earlier c. 4,000–3,650 BC and has a base of 27 m by 27 m and probably reached a height of 5.5 m. It culminated in a platform of about 12.5 m by 7.2 m, accessible via a ramp.

[5] Between 3500 and 3000 BC the remains of the original structure were completely covered with a layered mixture of earth and stone, and large blocks of limestone were then applied to establish a second platform, forming a step pyramid (36 m × 29 m, about 10 m in height), accessible by means of a second ramp, 42 m long, built over the older one.

[7] Archeological excavations from the chalcolithic Abealzu-Filigosa layers indicate the Monte d'Accoddi was used for animal sacrifice, with the remains of sheep, cattle, and swine recovered in near equal proportions.

Based on the evidence of architecture, ritual deposits and diagnostic pottery, G. and M. Webster argued, in 2017 & 2019, for the monument's status as a product of a migration event (probably exilic) initiated from Mesopotamia, during the first half of the 4th millennium B.C.E.