Opatija (Croatian: [opǎtija]; Italian: Abbazia; German: Sankt Jakobi) is a town and a municipality in Primorje-Gorski Kotar County in northwestern Croatia.

The traditional seaside resort on the Kvarner Gulf is known for its Mediterranean climate and its historic buildings reminiscent of the Austrian Riviera.

The tourist resort is situated on the Kvarner Gulf, part of the Adriatic coast, in a sheltered position at the foot of Učka massif, with the Vojak peak reaching at a height of 1,401 m (4,596 ft).

In Roman times, the area was home to several patrician villas connected to the nearby town of Castrum Laureana, the modern Lovran.

Conquered by King Pepin of Italy, son of Charlemagne, in 789, the Istrian peninsula up to the Kvarner Gulf was incorporated into the Carolingian March of Friuli by 803.

While western Istria was gradually conquered by the Republic of Venice by 1420, the remaining territory up to Opatija fell to the House of Habsburg and later was incorporated into the Austrian Littoral.

The town's modern history began in 1844, when Iginio Scarpa (1794–1866), a wealthy merchant from Rijeka, had the Villa Angiolina manor built in an extended park, where he received notable guests such as Ban Josip Jelačić.

In 1889 the Cisleithanian government officially declared Abbazia (Opatija) the first climatic seaside resort (Seebad) on the Austrian Riviera, rivalled by Brioni, Duino, Grado, and Portorož.

Villa Angiolina had many prominent guests Opatija is known for the Maiden with the seagull, a statue by Zvonko Car (1956), which is positioned on a promontory by the Juraj Šporer art pavilion.

A gilded variant of the statue Madonna, that once stood here but was demolished by communists after the end of World War II, now stands in front of Saint Jacob's Church.

Close-by, vis-a-vis Hotel Imperial, stands the statue The Fountain - Helios and Selena, a work of the Austrian sculptor Hans Rathautsky from 1889.

The movie, in good part shot in the Opatija-Rijeka region, is the conceptual prequel of the international TV Series "Sport Crime".