Eustace Llewellyn John CMG (1939 – 27 July 2017) was a Nevisian public servant who was the Deputy Governor-General for Nevis from 1994 to 2017.
John was a teacher and a customs officer from 1957 to 1960. In the 1960s, he worked in a number of positions in Saint Kitts-Nevis-Anguilla, first as a Social Welfare Officer for Saint Kitts and Nevis, then Chief Revenue Officer of Anguilla, then returning to Saint Kitts to work in the Customs and Excise Department, then the General Post Office, and later the Premier's Ministry. From 1971 to 1972, he was the Commercial and Accounts Manager at ZIZ Broadcasting Corporation (ZBC) in St. Kitts and the General Manager from 1972 to 1981. From 1981 to 1994, he was the Accountant General of Saint Kitts and Nevis.
In 1994, he became the second Deputy Governor-General for Nevis, succeeding Weston Parris, who served from 1983 until his death in 1992. In 1996, John received the Order of St Michael and St George (CMG).
In late April 2017, John stepped down as deputy governor-general. Marjorie Morton succeeded John as the deputy governor-general in September 2017.
John was married and had children, and was an Anglican lay reader.
On 27 July 2017, John died at the JN France Hospital, aged 78.