Le Tréport is a port town and seaside resort located in the Seine-Maritime department within the Normandy region of France. Situated in the Pays de Caux, it lies approximately 21 miles northeast of Dieppe at the junction of the D 940, D 78, and D 1015 roads. The town occupies a strategic position where the mouth of the river Bresle meets the English Channel, nestled between high chalk cliffs rising to 110 metres and a pebbly beach. It functions as a small fishing port and light industrial center, forming one part of the local grouping known as the "Three Sisters" alongside Eu and Mers-les-Bains.

The settlement, historically identified as the ancient Ulterior Portus, served as a notable port during the Middle Ages, enduring several English invasions. Its development into a popular seaside resort was inaugurated by the patronage of Louis-Philippe and his family, who resided regularly in nearby Eu. The arrival of the Tréport-Mers railway station on 12 May 1872 facilitated access for Parisians, leading to significant growth. A casino was constructed between 1896 and 1897, and an electric tramway operated from 1902 until 1934, supporting the tourist trade that flourished until the Second World War.

The town's character is defined by its dramatic geography and reconstructed architecture, particularly along the beachfront where many original villas were destroyed during the Normandy campaign. Key landmarks include the remains of an eleventh-century abbey, the chapel of St. Julien, the lighthouse, and the fourteenth-century church of St. Jacques du Tréport. The new funicular, built in 1907–08 and restored in 2006, links the town with the cliff-tops. Visitors can also explore two museums dedicated to local history and the Vieux Tréport heritage.

Le Tréport attracts visitors through its cultural attractions and historical sites, including the Kahl-Burg tunnel complex created by the German Army during World War II to deter Allied landings. The town has served as a filming location for notable works such as the 2014 thriller Witnesses and François Ozon's 2020 film Summer of 85. Until the 1970s, an oyster bed at the end of the pier allowed visitors to taste fresh seafood. The area retains a social history linked to the Parisian upper middle class who built villas on the waterfront in the late nineteenth and early twentieth centuries.

As of 2023, the population of Le Tréport is recorded as 4,378 residents. The local administration is led by Mayor Laurent Jacques of the PCF political party, who assumed office in January 2016. Transport access is provided via the Tréport-Mers station, which offers rail connections to Beauvais. The town's economy and appeal remain tied to its status as a seaside resort, supported by its casino and proximity to the English Channel, maintaining its role as a destination for tourism and leisure activities in northern France.