arrondissement of Saint-Omer (arrondissement de Saint-Omer)
- arrondissement in Pas-de-Calais department, France
- Country:
- Capital: Saint-Omer
- Coordinates: 50° 45' 0" N, 2° 10' 0" E
- GPS tracks (wikiloc): [Link]
- Area: 1090 sq km
- Population: 129373
- Wikipedia en: wiki(en)
- Wikipedia: wiki(fr)
- Wikidata storage: Wikidata: Q702409
- Wikipedia Commons Category: [Link]
- Freebase ID: [/m/09564z]
- GeoNames ID: Alt: [2977844]
- OSM relation ID: [2214006]
- INSEE arrondissement code: [625]
- GNS Unique Feature ID: -1467620
Includes regions:

canton of Aire-sur-la-Lys
- canton of France
- Country:
- Capital: Aire-sur-la-Lys
- Coordinates: 50° 39' 53" N, 2° 18' 41" E
- GPS tracks (wikiloc): [Link]
- Population: 30084
canton of Fauquembergues
- canton of France
- Country:
- Capital: Fauquembergues
- Coordinates: 50° 36' 6" N, 2° 5' 57" E
- GPS tracks (wikiloc): [Link]

canton of Lumbres
- canton of France
- Country:
- Capital: Lumbres
- Coordinates: 50° 41' 57" N, 2° 5' 35" E
- GPS tracks (wikiloc): [Link]
- Area: 501.04 sq km
- Population: 32553
canton of Saint-Omer-Nord
- canton of France (until March 2015)
- Country:
- Capital: Saint-Omer
- Coordinates: 50° 46' 27" N, 2° 12' 47" E
- GPS tracks (wikiloc): [Link]
canton of Saint-Omer-Sud
- canton of France (until March 2015)
- Country:
- Capital: Saint-Omer
- Coordinates: 50° 43' 55" N, 2° 13' 59" E
- GPS tracks (wikiloc): [Link]