Esther Grether (nee Kast, born c. 1936) is a Swiss art collector and businesswoman.
[1] She inherited a beauty and health care products company from her late husband Hans Grether in 1975 that she continues to run with her daughters.
[1] She has been chair of the board of the Basel-based Doetsch Grether Group for more than thirty years.
[2] In 2013 Forbes magazine estimated her and her family's net worth at US$1.5 billion.
[5][6] In December 1962, it was thanks to a bank guarantee provided by Hans Grether, secured on Doetsch Grether shares, that the Basel art dealer Ernst Beyeler was able to buy the American collector G. David Thompson's entire collection of 70 Giacometti works.