Castilian Club was an American women's study club. It was founded in Boston, Massachusetts, February 8, 1888, by Abba Goold Woolson after a visit to Spain. Sibylla Bailey Crane was a co-founder. According to the Certificates of Corporations Organized Under the General Laws of Massachusetts, the legal date of organization was April 6, 1898 while April 27, 1898 was the date of charter.