Muntham Court was a country house and estate near a village of Findon, West Sussex, England. In the 1800s the estate covered 1,890 acres (760 ha). Following the death of Ulric Oliver Thynne in 1957 the estate measuring about 1,025 acres (415 ha) was split up and auctioned off. In 1961 the house was demolished to make way for Worthing Crematorium that opened its doors on 5 January 1968.

Muntham Court history dates back to early 11th century when the lands were held by Osward in 1066. Later in 1073 William de Braose had rights of free warren in the area and his family held 38 manors in Sussex. In 1086 it was held by Morin. In the 14th century the estate was divided in two, Itchingfield passed to the Marlott family. In 1371 Thomas de Mundham, son of Johanne is presumed to have built the first house on the site, later in 1372-1372 he gave all the rights to the Manor of Muntham to Thomas Cornwallis from London.

In 1840 the estate was purchased by Thomas Fitzgerald of Binfield House, Berkshire. At this time 19 people farmed the estate, including 15 men and 4 boys. The staff consisted of a housekeeper, cook, 14 servants, lady's maid, steward, under butler, 2 toolman and coachman John Taylor (who lived with his wife in one of the lodges).

In 1850 Muntham was sold to Harriet Thynne, Marchioness of Bath and it remained in the Thynne family until the death of Colonel Ulric Oliver Thynne in 1957. Lady Thynne was the daughter of Alexander Baring, 1st Baron Ashburton and Ann Louisa Baring. In 1830 she married Henry Thynne, 3rd Marquess of Bath. At this time only the north side of the house was full-size. A single-storey laundry was located on the east side, while kitchens and pantries were on the west side. When Harriet Thynne first saw the red brickwork house, she said: "The upper classes do not live in red brick." At this time the house and the estate saw significant changes. The architect Henry Woodyer remodelled the house in flint in the Jacobean style and added a chapel between 1877 and 1888. The east side was squared off by removing a single-storey building and enlarging it by five window bays with bedrooms located above. The Dutch gables were extended, and Bath stone features were added. A difference in elevation meant that the east side of the house was being viewed from below, making it more imposing compared to the north side despite being the same size. The work was done with taste and restraint, making it a good example of a Victorian attempt to recreate early Jacobean style.

The staff was reduced during World War I and Colonel Ulric Oliver Thynne was assigned to command the Royal Wiltshire Yeomanry. At the time of World War II the estate was occupied by the Army.

In the first part of the 20th century a pair of wrought-iron gates from Seville Cathedral were installed at the East Lodge entrance, thought to have been plundered in 1812 during the Peninsular War.

Following the death of Colonel Thynne the house remained empty and the estate was put up for sale. It was advertised in Country Life magazine by John D Wood & Co. as appropriate for use as a school or a nursing home, but no suitable buyer was found and the estate measuring about 1,025 acres (415 ha) was split up. At the time of sale the main house had mains electricity and oil-fired central heating. Additionally an animal and corn farm of 802 acres (325 ha) was available to let for £1,492 (equivalent to £44,029 in 2023) per year. The estate was sold off at the auction on the 31st of October 1958 at Worthing Town Hall, auctioneer was Mr. Hazell.

In the 20th century many irreplaceable country houses were lost to redevelopment. After a campaign for a crematorium to serve Worthing led by Alderman Brackely, Worthing Borough Council purchased the country house and adjacent land from property developers Groves Brothers (who had obtained a planning permission for a crematorium). The house was demolished in 1961 after it was said to be found unsafe and surplus to local council requirements. At the time a large number of historic buildings in Worthing were demolished by Worthing Council with often little opposition from the public. Since then the town's planning activities are conducted with far greater sensitivity due to provisions in the Town and Country Planning Acts in the late 1960s as well as a shift in public opinion in 1970s towards preservation of Britain’s country houses as part of the national heritage.