Lydia Welti Escher, (née Lydia Escher, 10 July 1858 in Zürich-Enge – 12 December 1891 in Genève-Champel) was a Swisspatron of the arts and the daughter of Augusta Escher-Uebel (1838–1864) and Alfred Escher (1819–1882), among others the founder of the Gotthardbahn. Lydia Escher was one of the richest women of Switzerland in the 19th century, patron of the arts and established the Gottfried Keller Foundation.