Brigadier-General Sir Robert Chaine Alexander McCalmont KCVO CBE DSO DL (29 August 1881 – 4 November 1953) was a Northern Irish unionist politician and British Army officer.
Macalmont was born in Merrion Square East in Dublin, the son of Colonel and MP James Martin McCalmont, and Mary Caroline Roman. He was educated at Eton College.
In 1900, he joined the Royal Warwickshire Regiment and served in the Second Boer War.
After the death of his father, Robert Macalmont took his father's seat as an Irish Unionist MP in the House of Commons for Antrim East at the 1913 by-election.
He served with the Irish Guards in the First World War, and reached the rank of Brigadier-General. He was appointed a Companion of the Distinguished Service Order in the 1917 New Year Honours and a Commander of the Royal Victorian Order in the 1937 Coronation Honours. He was appointed Honorary Colonel of 48th (South Midland) Divisional Signals, Royal Corps of Signals, on 16 July 1937. He was appointed a Knight Commander of the Royal Victorian Order in 1952.
He died in a Dublin nursing home in 1953, aged 72.