Coordinates: 48°55′36″N 0°27′07″W / 48.9267°N 0.4519°W / 48.9267; -0.4519

Saint-Omer is a commune in the Calvados department in the Basse-Normandie region in northwestern France.

St.Omer was founded in the 7th century by monks, one of whom was called Omer. It became part of France in 1677. Le Blockhaus d'Eperlecques was the original bunker for manufacture of V2 rockets.

The French department of Calvados (pronounced: [kal.va.dos]) is part of the region of Basse-Normandie in Normandy. It takes its name from a cluster of rocks off the English Channel coast. The pronunciation varies: in French the final 's' is not mute; in English usually Calvadoss with stress on the first syllable.

Calvados is one of the original 83 departments created during the French Revolution on 4 March 1790. It was created from a part of the former province of Normandy. The name "Orne inférieure" was originally proposed for the department, but it was ultimately decided to call the area Calvados.

Its etymology is most likely derived from the Salvador, a ship from the Spanish Armada that sank by the rocks near Arromanches-les-bains in 1588. However, others insist that the name Calvados was derived from calva dorsa, meaning bare backs, in reference to two sparsely vegetated rocks off its shore.

After the allied victory at Waterloo the department was occupied by Prussian troops between June 1815 and November 1818.