Blenheim is the most populous town in the region of Marlborough, in the north east of the South Island of New Zealand. It has an estimated urban population of 30,500. The surrounding Marlborough wine region is well known as the centre of the New Zealand wine industry. It enjoys one of New Zealand's sunniest climates, with warm, relatively dry summers and cool, crisp winters.

Marlborough District or the Marlborough Region, commonly known simply as Marlborough, is one of the 16 regions of New Zealand, located on the northeast of the South Island. Marlborough is a unitary authority, both a district and a region. Marlborough District Council is based at Blenheim, the largest town. The unitary region has a population of 52,200.