A 33-year-old man is in Wellington Hospital with a serious head injury following and assault in Stokes Valley last night.

Wellington District Police was investigating the assault, which occurred just after midnight this morning in Stokes Valley.

CIB and Hutt Valley Police have worked throughout the night investigating the circumstances around the assault and will conduct a scene examination today.

Police were appealing to the public for any witnesses to come forward in regards to any incidents in the area of Hanson Grove, Stokes Valley in the early hours of this morning.