The Archaeological Collection consists of artefacts dating back to the period from prehistoric to modern times, acquired through donations and purchases or through systematic rescue archaeological research, reconnaissance and archaeological field trips. Highlights of the Collection include hundreds of archaeological finds from the bed of the River Cetina. These are bronze and iron artefacts dating from Prehistory, Antiquity, the Middle Ages and modern times.
Stone hand wedges found in the bed of the River Cetina at Han and Rumin date back to the Old Stone Age, or the Palaeolithic. The Upper Palaeolithic and the Mesolithic are represented by archaeological materials from the sites of Okruglo at Radošić and Glavičica in the Sinjsko Polje Valley alongside the River Cetina near Trilj.
The Ethnographic Collection mainly comprises textiles, items of women’s and men’s traditional clothing, mostly dating from the late 19th and early 20th centuries. Wool and linen items of clothing have witnessed the rich tradition of the Cetinska Krajina Region through their making and decoration techniques.
Other valuable artefacts in the Collection include jewellery, but also utilitarian household objects, for instance, distaffs, wooden agricultural tools, wooden chests, looms, pottery, etc.
The Numismatic Collection comprises Greek, Celtic, Roman Republican, Roman Imperial and Byzantine coins, medieval and modern money as well as occasionally-produced series of gold and silver coins. These were mostly discovered at different archaeological sites in the Cetinska Krajina Region: Sinj, Čitluk, Gardun, Jasensko, Bisko, Trilj, Otok, Lučane, Koljani, Gala, Glavice, Turjaci, Hrvace, Jabuka, Udovičići.
The Collection's highlights include the Greek coins from Dyrrhachium and Apollonia, Celtic coinage, the coinage of the Kingdom of Numidia as well as the coins of Roman Emperors Honorius and Constantine the Great and his sons.
The Cultural History Collection contains a diverse range of objects, among which clay pipes and horseshoes stand out due to their number and perfectly preserved condition. The clay tobacco pipes were found following archaeological fieldwork at the Old Town fortress in Sinj, and the pipes of Austro-Hungarian, Ottoman, English and Zelovo provenance are represented. All the examples belong to the period from the mid 17th to late 19th centuries. Other valuable artefacts include the Second World War-related material (vessels, medical instruments, typewriter, watch), a tricycle dating from the 2nd half of the 19th century, flags and other various artefacts..
The Natural History Collection numbers 324 objects that were mostly collected in the 1970s following archaeological field trips led by the Museum's first director, Professor Ante Vuletić. The material of this modest, yet valuable collection comes mainly from different archaeological sites in the Cetinska Krajina Region: Ruduša-Sinj, Glavice, Brnaze, Karakašica, Suhač, Lučane, Zelovo, Krinj, Bajagić, Peruća, Maovice, Vrlika, Gljev, Koljani, Dabar, Bitelić, Obrovac, Jabuka, Ruda, Strmendolac. The Collection is home to 149 examples of fossils, the most common of which are the examples dating from the Middle Triassic (Anisian) 230 million years old. It also contains 151 examples of the commonest minerals and rocks in the Cetinska Krajina Region. The fossilised remains of a mastodon (teeth) discovered at Ruduša in Sinj also represent significant finds
The Collection of Documents consists of 1510 items. The contents include a wide range of documentary material dating from the 19th century to the present. The mainstay of the Collection is the Second World War-related material, mainly assembled in the second half of the 20th century, when the Museum of the Cetinska Krajina Region was also founded.
Valuable documentary material comprises publications and documents witnessing different events relating to political institutions, humanitarian, cultural and commercial organisations from the first half of the 20th century (the interwar years) and the Second World War period. The largest part of the Collection covers official correspondence between the National Liberation Committees on the levels of villages, towns and districts, circulars, requisition forms, receipts, ordinances, proclamations, instructions, notes and monthly reports. The Collection's highlights include an occasional sonnet published in 1838 on the occasion of holding the solemn Alka in honour of King of Saxony Frederick Augustus II, and an occasional poem honouring the visit to Sinj of Archduke of Austria Franz Carl on 22 October 1842.
The prominent place in the Collection is occupied by the original architectural and construction project documentation of the Režija duhana building complex. The documentation dates from 1894, was created at Vienna, and includes situational plans, layouts, cross sections and other related documents.
The Collection of Photographs and Photographic Equipment numbers 4357 objects dating back to the second half of the 19th century and the 20th century. Due to their content (different museum events, museum material), some of the photographs have been transferred to the Museum's photographic archive. The Collection is home to various photographs depicting public events in political, economic and cultural life of Sinj and the surrounding villages. The oldest photographs inlude the portraits of the Grabovac family, dating back to 1879. Photographs existing separately within the Collection comprise the Second World War photographs, namely, the photographs of different groups of prominent partisan fighters and fighters of the 10th Dalmatian Brigade (the Cetina Brigade), portraits of national heroes and fallen fighters, photo documentations of the execution by firing squad of the members of the First Split Partisan Detachment in 1941 at Sinj and the exhumation of the executed partisans in 1943, as well as the photographs of the celebration of the Day of the Independent State of Croatia (NDH) that took place in 1944 at Sinj. The postwar-period photographs and photo albums of the Second World War memorials are also significant. Valuable photographic material includes photographs of certain public and private buildings, squares, parks and bridges in Sinj and the surrounding area, photographs of promotions of scientific journals and books, photographs of preliminary meetings, photographs of tablets bearing names of streets and schools, photographs of different anniversaries, celebrations and annual meetings, and photographs of paintings preserved in church and private collections in Sinj. The Collection also contains various items of photographic equipment.
Most of the works in the Art Collection have been collected since the 1950s, mostly through donations by artists and purchases. The largest part of this collection covers oil paintings, watercolours, prints and sculptures by a number of artists. Some of the artists represented in the Collection include Stjepan Baković, Frano Šimunović, Pavle Perić, Stipe Sikirica, Anton Vrlić, Ivo Filipović Grčić, Vladimir Vrljić Ankin, Zlatko Sirotić, Fedor Malančec, Fadil Hadžić, Ivan Krstulović, Dubravko Gjivan, Mile Skračić, Zlatko Slišković, Mate Šimundža, Mile Prpa and Marko Gugić.
The Collection of Decorations, Medals and Plaques consists of 100 items, which comprise the First and Second World War decorations as well as the decorations from the Independent State of Croatia (NDH) and those from socialist Yugoslavia (Order of Work, Order of Merit for the People, Partisan Commemorative Badge 1941), medals, plaques, awards, stamps and religious medals. The objects mostly date from the 19th and 20th centuries..
The Collection of Postcards consists of picture postcards and postcards, which help us trace the development of photography and publishing in Sinj (the Žanko and Dedić brothers, Josip Bilić, Michael Čurković, N. Brainović, Buljan brothers). Postcards from the Collection have also witnessed collaboration between the Sinj publishers and renowned European publishing houses, for instance, Purger & Co. from Munich, W. L. from Budapest, Vittorio Stein from Trieste, Minerva from Prague, Cecami from Italy. The postcards depict details from the lives of the Sinj notables (Uroš Masovčić, Stjepan Celmić) as well as the distinguished figures in Croatian history (the Grisogono family, Fr Mirko Davidović, Prof. Josip Boko, Fra Joakim Friganović). The Museum's postcards have vividly and immediately witnessed certain segments of life, have helped us trace the urban development, and are a priceless cultural-historical resource for depicting the past of Sinj and the Cetinska Krajina Region.