Donald Stewart Box (22 November 1917 – 12 July 1993) was a Welsh and Conservative politician.
Born in Cardiff, Box was educated at The Cathedral School, Llandaff, St John's School in Pinner, and Harrow County School for Boys. He joined the stockbrokers' company Henry J. Thomas at the age of 17. At the outbreak of the Second World War he joined the Royal Air Force and served in the middle east in Egypt, Palestine and Transjordan. This experience gave him knowledge and interest in the Middle East refugee problem which he took up later in life.
He returned to Cardiff following the war and became a member of the Cardiff Stock Exchange and a partner in Lyddon & Company, stockbrokers. Having joined the Young Conservatives, Box graduated to the Conservative Party and fought Newport at the 1955 general election and a by-election the following year.
For the 1959 general election, Box was selected for Cardiff North and won the seat. He made his mark as a strong opponent of strikes (especially unofficial ones). He championed the cause of business and of redevelopment of Cardiff's docklands, and blamed any failures on the left. In line with his constituency, in which a large proportion of the property was leasehold, he supported leasehold reform.