Erringham chapel is a former place of worship in the deserted medieval village of Old Erringham, north of Shoreham-by-Sea in the district of Adur, one of seven local government districts in the English county of West Sussex. Founded in the 11th century as a chapel of ease to St Nicolas' Church in the Saxon riverside village of Old Shoreham, it was in use for several centuries until depopulation caused Old Erringham to become unviable as a settlement. The chapel fell into ruin, and its remains have been incorporated into a barn on the farm which now occupies the site of the village. English Heritage has listed the remaining structure at Grade II for its architectural and historical importance.
The east bank of the River Adur—the area covered by the present-day town of Shoreham-by-Sea and its rural hinterland—was first settled during the Iron Age, and also saw Roman activity. During the Saxon era it became a prosperous agricultural area. Two villages developed next