Postwick is some 4.5 miles (7.2 km) east of the city of Norwich, just south of the eastern end of the A47 Norwich southern bypass on the north bank of the River Yare.

Witton lies 1.75 miles (2.8 km) to the north-east, north of the A47.

For the purposes of local government, the parish falls within the district of Broadland.

In the west of the parish at the junction of the A47 and A1042 is Postwick Park and Ride, one of six such sites surrounding Norwich.

It ceased c. 1939 after a collision with a coaster[3] The name "Postwick" means "Poss(a)'s specialised farm".