Rhenish Girls' High School is a public English medium high school for girls situated in Stellenbosch in the province of Western Cape in South Africa.

It was founded in 1860, thus making it the oldest girls' school in South Africa (tied with La Rochelle Girls' High School in Paarl).

[1] The school was founded by a German mission on 1 May 1860 for the education of the daughters of the missionaries, and had 8 pupils in its first year.

The two sites with their separate age groups remained a single school, and celebrated the centenary in 1960.

[3] In 2006, a committee called Rhenish 150 was founded to coordinate the 150th anniversary celebrations of the high school.