Mundham, historically Mundaham or Mundhala, is a small village and civil parish in the county of Norfolk, England. Archaeological and toponymic evidence of Mundham's existence predates its appearance in the Domesday Book survey of 1086, dating back to c.130 AD in the late Pax Romana period, however, it was not called Mundham until sometime between the 5th and 7th centuries, although there has been consistent activity in the area since the early Neolithic period. In the 2011 census, the population was 177 in 64 households, however in the 2021 census, the population had dropped to 147, in 67 households. The parish covers an area of 6.31 km² (2.44 sq mi), and is approximately 9.1 miles (14.6 km) southeast of Norwich and 13.5 miles (21.7 km) west of Great Yarmouth.

For the purposes of local government, it falls within the district of South Norfolk, however Mundham does have a parish council responsible for local matters laid down by law, including a role in local planning, it consists of five councillors, and a clerk. The village contains a number of heritage-listed buildings, which include a 12th-century church, multiple farmhouses, and the ruins of a 13th-century church. The fields and woodland surrounding Mundham have changed little in the past 500 years, and the village itself remains rural with a low population density compared to the national average.

Mundham is located in the electoral district of Loddon, which is part of the South Norfolk district of the county of Norfolk, England. Near the centre of Mundham, there is a small stream which flows into the River Chet. Mundham borders the River Chet to the north, between Mundham and Bergh Apton, and is located 11 miles southeast of Norwich. In the west, it borders Seething, while in the northeast, it borders Sisland. In the southeast the extensions of Loddon reach. In the south Mundham borders Thwaite, and in the southwest it borders with Hedenham. The village sign is located near St Peter's Church, and depicts a series of houses in the foreground, with St Peter's church and the millennium oak in the background, the sign's supports are carved into a sheath of wheat, with a small mouse and a poppy hidden within them.

The name Mundham originates from the pre-7th century word Mund, which is the nominative plural of the Old English word munda, meaning "protector", "guardian" or "hand", or the Old Saxon noun mund, meaning "hand", both of which come from the Proto-Germanic mundō, which itself comes from the Proto-Indo-European word *mh₂-nt-éh₂, which means "the beckoning one". The suffix -ham is the Old English noun meaning "homestead, village, manor or estate," which comes from the Proto-West Germanic haim, meaning "home". The suffix -hamm is the Old English for "enclosure", "land hemmed by water or marsh or higher ground", "land in a riverbend", "rivermeadow" or "promontory", which comes from the Proto-West Germanic verb hammjan, meaning "to pinch", "to hem" or "to enclose". Both -hamm and -ham appear as -ham in modern place names.

Mundham was founded nearly two millennia ago, in the late Pax Romana period, with the earliest Roman evidence dating from the reign of Hadrian, however, the name of Mundham dates from the early Anglo Saxon period, in the Kingdom of East Anglia, during the Heptarchy, in the 5th to 7th century AD. St Peter's Church and Mundham Hall were built between then and 1086, as they appear Mundham's entry in the Domesday Book. In the 12th/13th century, Mundham was split into Mundham St Peter's (Mundham Magna) and Mundham St Ethelbert's (Mundham Parva), and St Ethelbert's Church was built for use by Mundham Parva, until 1454 when Mundham reunified, despite this St Ethelbert's stayed open until 1749. In the 12th century, the current iteration of St Peter's was built. Throughout the 19th century, the major landowners of Mundham were usually the owner of Mundham house, which was built sometime prior to 1845, and the lord of the manor in Dickleburgh-Manclere. Across from the Church, Roman coins and other artefacts have been found, dating from 130 AD until the end of the Roman Empire's occupation of Britannia in 410 AD.

Mundham was founded as a settlement in the late Pax Romana period, built on the sandy soil of the river Chet, however there has been activity here since the earliest period of human settlement in Norfolk. Mesolithic blades, and burnt and worked flints as well as Neolithic flints have been found in nearby fields, as have flint and bronze axes, scrapers and many other objects.

A number of early Neolithic pits have been discovered, one of which contained burnt wood and debris and a human cremation, other nearby pits have been dated to the Bronze Age, and a ditch and another two pits have been dated to the Iron Age. Evidence of the Bronze Age appears in a number of ring ditches, enclosures and linear crop marks. Objects found include arrowheads, assorted metal tools and pottery sherds. Iron Age artefacts were found, along with postholes, ditches and pits. Objects from the period include coins, jewellery and pottery.

There is evidence of a Roman settlement, as Roman bricks and tiles, as well as many sherds of Roman pottery have been found, as have personal items such as brooches and cosmetic tools, and coins.