Neatham is a Roman hamlet, an ancient hundred and a former civil parish, now in the parish of Alton, in the East Hampshire district of Hampshire, England. Its nearest town is Alton, which lies 1.6 miles (2.6 km) south-west from the hamlet. In 1931 the parish had a population of 134.

The lost Roman settlement of Vindomis is believed to be at Neatham. Its strategic importance lay in its being at the crossing of important roads: one from Winchester towards London and the other from Chichester to Silchester, a large Roman town to the north of present-day Basingstoke. The name Vindomis might be translated as ‘(The mansio) of the wine country’ (although this may equally be a Celtic name, with the prefix VINDO-'white'). Vindomis may well have been the administrative centre of a large estate associated with the potteries. The population at this time is estimated to have been 2,500.

Neatham was formerly a tything in the parish of Holybourne. From 1866 Neatham was a civil parish in its own right; on 1 April 1932 the parish was abolished and merged with Alton and Binsted.

After the Romans left, it became a Saxon settlement, called Neatham, indicating the presence of a cattle market. For several centuries, Neatham remained the chief place in the area and the focal point of Neatham Hundred, which included a large part of north-east Hampshire.

At the time of the Domesday Book in 1085, Neatham was recorded as a hundred belonging to the Crown comprising 96 households. Neatham Hundred included 24 other places. After the founding of Waverley Abbey in 1128, King Steven made a gift of Neatham for the Abbey to establish a Grange and an Oratory, with a community of 12 monks, independent of the parish of Holybourne. Eventually, Neatham was eclipsed by Alton and, in the 12th century, the area was renamed the Alton Hundred.

When Henry VIII dissolved the monasteries, Neatham went into lay hands and became part of the parish of Binsted.

In the 1980s, Neatham elected to be joined to Holybourne. Neatham is now a hamlet comprising a Manor House, a Grange, a mill, and a dozen cottages. Today, the hamlet lies along the Alton bypass between Alton and Farnham. Its Grade I buildings and mills still remain.

Neatham Grange

• Mill House (C.19)

Upper Neatham Mill

• Mill House. Possible C.18 or earlier.
• Barn

Neatham Mill

• Mill and Barn . Mostly C.19.
• Dovecote C.18

Neatham Manor

• Manor House Possible C.18.
• Dovecote C.16/17

• VINDOMIS? Minor Romano-British Settlement: Neatham, Hampshire?
• Neatham
• PROPOSED CONSERVATION AREAS AT LOWER NEATHAM MILL AND ISINGTON