Beecroft Art Gallery has a permanent collection of over 2000 works, ranging from 17th-century Dutch paintings to contemporary works.

The collection includes examples by artists such as Molenaer, Ruisdael and Berchem plus 19th-century artists including Rossetti, Constable and Edward Lear. There are works by Carel Weight, the Great Bardfield Group, and a fine bronze by Jacob Epstein. The local artist Alan Sorrell is represented by his Drawings of Nubia series depicting a visit to Egypt prior to the building of the Aswan Dam. The Thorpe Smith Collection of local landscape views contains paintings, drawings and prints from as early as 1803.

Southend Museums Service has been acquiring fashion as part of its social history collection since opening in the 1970s. The collections have subsequently been re-housed at the Beecroft Art Gallery and fashion history exhibitions take place there once a year.

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The collections' main strengths are the decades from the 1920s to the 1970s but there are important earlier pieces, most notably a rare, 17th century slap sole shoe. Not surprisingly, beach wear is a major area of collection: in 2009 Southend received a donation of 500 bathing suits from private collector, Mavis Plume. They date from around 1900 to the 1980s and include several rare pieces.

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