Oosthuizen Coat of Arms

The surname Oosthuizen is a Dutch toponymic surname, meaning "eastern houses". It is most common in South Africa, where it is an Afrikaner surname.

The earliest known record of the surname Oosthuizen dates back to the 12th century, when it was mentioned in the context of a village in the Netherlands. The village was first mentioned as "in Asthusa minore", and means "eastern houses". Minor or luttic was often added to distinguish from Grosthuizen. Oosthuizen started as a peat excavation settlement in the Zeevang polder.

The surname Oosthuizen was brought to South Africa by Dutch settlers in the 17th century. The settlers were primarily farmers, and they settled in the Cape Colony. The surname Oosthuizen quickly became one of the most common surnames in the Cape Colony, and it remains so today.

Some notable people with the surname Oosthuizen include:

• Andries Oosthuizen, South African golfer
• Caylib Oosthuizen, South African rugby union player
• Coenie Oosthuizen, South African rugby union player
• D. C. S. Oosthuizen, South African philosopher
• Devin Oosthuizen, South African rugby union player