The Usher Gallery is home to a collection of fine art, decorative art and horology. There is a strong Lincolnshire collection, including works by William Logsdail, Frank Bramley, Charles Shannon, William Hilton and Peter de Wint. Lincolnshire people and places are also represented in works by Benjamin West, George Stubbs, JMW Turner and LS Lowry.
The Gallery has a good collection by 20th Century artists including Venessa Bell, Duncan Grant, John Piper, Mary Potter and Ivon Hitchens.
Long case clocks, pocket watches, ceramics, glass and silver are among the decorative and horological collections on display.
The gallery has recently acquired contemporary works by Oliver Laric and Lothar Götz, in conjunctions with its contemporary exhibition programme. Other more recent acquisitions include works by Grayson Perry, Edmund de Waal and Luke Jerram.
Both the gallery and the museum host a number of temporary exhibitions each year.