Naomi Merlith Sim (née Plaskitt; 30 November 1913 – 3 August 1999) was an English actress and writer.

Naomi was "effectively born into a single-parent family", having "little if any contact with her father"; Hugh Plaskitt would die of malaria in Africa in 1917 whilst serving as a soldier during the First World War.

When she was 12 years old she met Alastair Sim while appearing in a play, The Land of Heart's Desire, organised by Scottish Community Drama Association.

[1] Sim was an elocution teacher at an Edinburgh school at the time and was 28 years of age when they met.

[1] In 1932 she had completed two years at the Royal Academy of Dramatic Art under a scholarship when she replaced her ambition for drama with her love for Sim.