William Henry Crossland was a nineteenth century architect from the United Kingdom.

He is best remembered for his three most important commissions.

The first is Rochdale Town Hall, built in 1866-71.

The second is the Holloway Sanatorium, built in 1873-85. This was project commissioned by the philanthropist Thomas Holloway, and is located at Virginia Water, Surrey.

The third, which was also commissioned by Thomas Holloway, is Royal Holloway College, a short distance away from the Sanatorium in Egham, Surrey. This was built in 1883-88.

The Holloway Sanatorium and Royal Holloway College were both inspired by the Château de Chambord in the Loire Valley, France, and are considered to be among the most remarkable buildings in the South of England.