Blanca Elena Errázuriz Vergara (9 April 1894 – 20 March 1940), also known as Bianca de Saulles, was a Chilean socialite and the former wife of football player and businessman John de Saulles.
In August 1917, Errázuriz fatally shot de Saulles multiple times during a disagreement over the custody of their son.
After a highly publicized and sensational trial, Errázuriz was acquitted of her ex-husband's murder.