The Siret or Sireth (Ukrainian: Сірет or Серет, Romanian: Siret pronounced [siˈret], Hungarian: Szeret, Russian: Сирет) is a river that rises from the Carpathians in the Northern Bukovina region of Ukraine, and flows southward into Romania for 470 km before it joins the Danube. In ancient times, it was named Hierasus.

The following towns and villages are situated along the river Siret, from source to mouth: Berehomet, Storozhynets, Siret, Grămeşti, Zvoriştea, Liteni, Dolhasca, Paşcani, Stolniceni-Prăjescu, Roman, Bacău, Adjud, Mărăşeşti, Galaţi.

The following rivers are tributaries to the river Siret:

Left: Bahna, Molniţa, Bahna, Gârla Sireţel, Gârla Huţanilor, Vorona, Pleşu, Turbata, Pitrosul, Trestioara, Sireţel, Sodomeni, Stolniceni, Hărmăneşti, Pârâul Ţigăncilor, Mihailei, Boca, Albuia, Vulpăşeşti, Ţiganca, Icuşeşti, Glodeni, Râpaş, Pârâul Morii, Răcătău, Fulgeriş, Polocin, Lupa, Bârlad, Călmăţui, Gerului, Mălina, Fălcoaia, Cătuşa

Right: Găvan, Negostina, Verehia, Baranca, Leahu, Hănţeşti, Grigoreşti, Sălăgeni, Suceava, Şomuzul Mic, Şomuzul Mare, Probota, Conţeasca, Ruja, Valea Părului, Podul Turcului, Tămăşeni, Moldova, Valea Neagră, Turbata, Bistriţa, Cleja, Răcăciuni, Orbeni, Botohan, Fântânele, Conţeşti, Trotuş, Valea Boului, Carecna, Zăbrăuţi, Şuşiţa, Gârla Morilor, Putna, Leica, Râmnicul Sărat, Buzău

Siret (Romanian pronunciation: [siˈret]; German: Sereth, Polish: Seret) is a town in Suceava County, Romania. It is situated in the historical region of Bukovina. Siret is one of the oldest towns in, and a former capital of, the former principality of Moldavia. At the 2011 census, Siret had a population of 8,118 inhabitants. The town administers two villages, Mănăstioara and Pădureni.

The town of Siret is located at the north-eastern limit of Suceava County, 2 km from the border with Ukraine, being one of the main border passing points in the North of the country, having both a road border post and a rail connection.

The rail is on a standard gauge on the Romanian side and continues as a Russian-style broad gauge into Ukraine. Siret (actually a nearby village called Vadul Siret) is one of the few places in Romania which provides a gauge change equipment, allowing transportation without transfer.

Siret is situated at the half distance between Chernivtsi and Suceava, on the right banks of Siret River. The European route E85 crosses the city.

Luis Siret y Cels (Sint-Niklaas, 26 August 1860 – Herrerías, 7 June 1934) was a Belgian-Spanish archaeologist and illustrator.

He was born in Belgium, but when he was 21 he went to Cuevas del Almanzora (Almería) when he was contracted by the mining company Almagrera as a Mining Engineer.

Though 50 years, Luis Siret and his brother Henri Siret investigated Neolithic, chalcolitic and Bronze Age sites in Almizaraque, Palacés, El Argar, El Gárcel or Los Millares. His discoveries meant a great advance in the history of South-easterner Iberian Peninsula and helped settle the sequence from Palaeolithic to Copper Age in the zone. His works were exhibited in 1900 Exposition universelle de Paris and 1929 Exposición Universal de Barcelona, and they are currently exhibited in the Museo Arqueológico Provincial de Almería, in the Museo arqueológico Nacional de Madrid, in the Museé du Cinquentenaire in Brussels and several important collections all over the world including in The British Museum in London.