Saint-Loup (French pronunciation: [sɛ̃ lu]) is a commune in the Charente-Maritime department in the Nouvelle-Aquitaine region in southwestern France.

The village lies on the stream Bibot, which empties into the Soie (Charente basin).

In late August, it organizes tours of roads and passages of the commune.

The commune has migratory birds along with hibernal ones including ducks and waders.

The swamplands were drained and farmlands expanded during the reign of Louis XIV.