Trogir (grčki: Tragurion, latinski: Tragurium, talijanski: Traù) je grad u Hrvatskoj koji administrativno pripada Splitsko-dalmatinskoj županiji.
Grad Trogir osnovali su grčki kolonisti s otoka Visa u III. st. pr. Krista. U srednjoj Europi smatran je najbolje sačuvanim romaničko-gotičkim gradom. Dvorac i kula okruženi zidinama sačinjavaju jezgru Trogira.
Najznačajniji kulturni spomenik je trogirska katedrala, čiji je portal zapadnih vrata izradio Majstor Radovan. Grad Trogir smješten je na obali Kaštelanskog zaljeva, na otoku između Čiova i kopna, spojen kamenim mostom s kopnom. Trogir oduševljava posjetitelje kulturno-povijesnim spomenicima i malim ulicama te umjetničkim zbirkama s brojnim remek djelima.
Ulazak u sakralne objekte otkriva neke manje i više poznate detalje iz povijesti. Trogir je jedan od gradova, koje je najbolje posjetiti uz stručno vodstvo turističkog vodiča, van glavne sezone i turističke gužve.
Arheološka istraživanja pokazuju da je čovjek na trogirskom otoku boravio već u dalekoj prapovijesti.
Trogir (Tragurium) kao naselje su tijekom III. st. pr. Kr. utemeljili grčki kolonisti, trgovci s Isse (Visa). Rimski Oppidum isticao se kvalitetnim mramorom. U to doba, život se nije odvijao samo u gradu nego i u polju, u rustikalnim vilama. Nedaleko od grada, oko brda Bijaći u naselju Siculi, u prvoj polovici I. st. car Klaudije naselio je svoje islužene veterane.
U Trogiru je 1271. otvorena prva ljekarna u Europi. Nalazila se u sklopu kuća u blizini katedrale i gradske lože. Izvorni dokument koji to potvrđuje je u privatnoj zbirci, a kopija u trogirskom muzeju.
Stari dio grada Trogira uvršten je na UNESCOv popis Spomenika svjetske kulturne baštine.
Trogir (Latin: Tragurium; Italian: Traù; Ancient Greek: Τραγύριον, Tragyrion or Τραγούριον, Tragourion Trogkir)
In the 3rd century BC, Tragurion was founded by Greek colonists from the island of Vis, and it developed into a major port until the Roman period. The name comes from the Greek "tragos" (male goat). Similarly, the name of the neighbouring island of Bua comes from the Greek "voua" (herd of cattle). The sudden prosperity of Salona deprived Trogir of its importance. During the migration of Croats the citizens of the destroyed Salona escaped to Trogir. Initially the Roman Tragurium was one of the Dalmatian City-States. From the 9th century on, Trogir paid tribute to Croatian rulers and to the Byzantine empire. The diocese of Trogir was established in the 11th century (abolished in 1828; it is now part of the Roman Catholic Archdiocese of Split-Makarska and has temporarily been a Latin titular bishopric) and in 1107 it was chartered by the Hungarian-Croatian king Coloman, gaining thus its autonomy as a town.
In the year 1000 the Republic of Venice received submission from the Tragurium inhabitants and the city started since then to have commerce with the Italian peninsula enjoying cultural and economic improvements.
In 1123 Trogir was conquered and almost completely demolished by the Saracens. However, Trogir recovered in a short period to experience powerful economic prosperity in the 12th and the 13th centuries, with some autonomy under Venetian leadership. In 1242 King Béla IV of Hungary found refuge there as he fled the Mongols. In the 13th and the 14th centuries, members of the Šubić family were most frequently elected dukes by the citizens of Trogir; Mladen III (1348), according to the inscription on the sepulchral slab in the Cathedral of Trogir called "the shield of the Croats", was one of the most prominent Šubićs. In Dalmatian, the city was known as Tragur.
After the War of Chioggia between Genoa and Venice, on 14 March 1381 Chioggia concluded an alliance with Zadar and Trogir against Venice, and finally Chioggia became better protected by Venice in 1412, because Šibenik then became the seat of the main customs office and the seat of the salt consumers office with a monopoly on the salt trade in Chioggia and on the whole Adriatic Sea.
In 1420 the period of a long-term Venetian rule began and lasted nearly four centuries, when Trau (as the city was called by the Venetians) was one of the best cities in the Balkans with a rich economy and plenty of Renaissance works of art and architecture. In about 1650, a manuscript of the ancient Roman author Petronius' Satyricon was discovered in Trogir containing the 'Cena Trimalchionis' ('Dinner of Trimalchio') the longest surviving portion of the Satyricon, a major discovery for Roman literature.
On the fall of Venice in 1797, Trogir became a part of the Habsburg Empire, which ruled over the city until 1918, with the exception of Napoleon Bonaparte's French occupation from 1806 to 1814 (when the city was part of the Napoleonic kingdom of Italy).
After World War I, Trogir, together with Croatia, became a part of the State of Slovenes, Croats and Serbs and subsequently, the Kingdom of Yugoslavia. During this period Italian citizens, who until 1918 were the ruling class and almost half of the population, were forced to leave for Italy. During World War II, Trogir was conquered by Italy and was part of the Italian Governorate of Dalmatia. Subsequently Tito's partizans occupied it in 1944. Since then it belonged to the second Yugoslavia, and from 1991 to Croatia.