The Hittite Monuments Site Index (HMSI) is based on information from the website Hittite Monuments (https://www.hittitemonuments.com/), maintained by Tayfun Bilgin. This digital humanities project aims to provide visual references to all major Hittite/Neo-Hittite period stone monuments in a Turkish and English version. A brief description, photographs and bibliographical references make this data collection an essential up-to-date reference work. For the Hittite Monuments Site Index (HMSI) the information available on the website Hittite Monuments was recorded in a table, provided with a standardised object description and thus published on the repository zenodo as the Hittite Monuments Site Index (HMSI). Columns: OID: object ID. Name: site name. Period: Empire Period; Neo-Hittite Period. Type: mobile object: base (bull-base; lion-base; sphinx-base); building inscription; orhostat; statue (bull-man; portal-bull; portal-lion; portal-sphinx; storm-god; winged-genie); stele. immobile object: complex; rock inscription; rock relief. further details: image; inscription. condition: fragment. iconography: altar; bull; deity; Enki; funerary-stele; Giglamesh; king; Kubaba; lion; mountain-god; queen; sphinx; stag-god; storm-god. language: aramaic; assyrian; greek; hittite; luwian; phoenician; roman; 0 [=no inscription]. link: URL of the website Hittite Monuments. accuracy of point: certain; representative; tentative. x: longitude coordinate (WGS 84) y: coordinate latitude coordinate (WGS 84) museum: current location (museum name; in situ) dimension: in cm in situ: yes; no; ?