Selection of participants Contestants from fifty-eight countries and territories were selected to compete in the pageant. One candidate was appointed to represent her country to replace the original dethroned winner.
Replacements Miss Dominion of Canada 1966, Diane Coulter, withdrew for health concerns and was replaced by her first runner-up, Marjorie Schofield.
Debuts, returns, and withdrawals This edition saw the debut of Guam, and the returns of Lebanon and Singapore which last competed in
1962; Morocco in
1963; and Argentina, Suriname, and Trinidad and Tobago in
1964. Miss Tunisia, Zeineb Lamine, and Miss Uruguay, Susana Regeden, both withdrew for undisclosed reasons. Hong Kong, Mexico, and Portugal withdrew after their respective organizations failed to hold a national competition or appoint a delegate. Miss Honduras 1966, Danira Miralda Buines, and Miss Saint Vincent 1966, Anna Ellis, both withdrew for undisclosed reasons. ==Results==