Janet Erskine Stuart, also known as Mother Janet Stuart, was a Roman Catholic nun and educationalist.
Her father, The Rev the Hon Andrew Godfrey Stuart, a son of Earl Castle Stewart, was the Rector of Cottesmore and she was the youngest of his thirteenth children. Her mother, his second wife, was Mary Penelope Noel, a relative of the Earl of Gainsborough.
She converted to Roman Catholicism at the age of 22 and in 1882, she entered the Society of the Sacred Heart at Roehampton.
Stuart believed that each parent had the right to ask the teachers: "What have you done with my child, for my child? Show me the trace of your influence on her mind, heart, character, and conduct". She also believed, "it is not so much what we say or do that educates; what really educates is who we are". Sister Janet Stuart insisted that educators must "bring up children for the future, not for the present".