Mary McKenzie Finlay, RRC (28 January 1870 – 21 March 1923) was an Australian army nurse and matron at Melbourne Grammar School.

She was the eldest of thirteen children born to station master/land valuer James and Elizabeth (née Hill) Finlay.

In December 1907 she was appointed matron at Melbourne Grammar School, where she remained until the outbreak of the First World War.

[1] In the 1917 New Year Honours, Finlay was awarded the Royal Red Cross "in recognition of valuable service with the Armies in the Field".

She returned to her role of matron at Melbourne Grammar School, from which she resigned in 1922 due to ill health.