(Antonia) Marian Gamwell OBE (28 July 1891 – 13 May 1977) was a United Kingdom volunteer ambulance driver and commanding officer of the First Aid Nursing Yeomanry (FANY).

She served with her sister Hope Gamwell during World War I and they then ran a farm in what is now Zambia.

[1] Her brother, Frederick Whittington Gamwell, was one of the pilots awarded an Aviator's Certificate by the Royal Aero Club in 1914.

[2] She and her sister's education was at Roedean School and after that they taught themselves mechanics by taking their mothers car to bits.

[1] The Scottish Women's Hospital that was established there operated throughout the war, but in May 1915 the two sisters volunteered to join the First Aid Nursing Yeomanry.

[1] In April 1918 Marian had to return home due to suspected appendicitis but when recovered she went to work in a munitions factory for Rolls-Royce.

Between the wars the two sisters ran a coffee farm in Northern Rhodesia (Zambia) at a place called Abercorn, now Mbala.