Selection of participants Contestants from thirty countries and territories were selected to compete in the pageant. This is the last edition before
2023 where women who are married and have children can participate. Two contestants were selected to replace the original dethroned winner.
Replacements Guðlaug Guðmundsdóttir, the first runner-up of Miss Iceland 1956, was appointed to replace Miss Iceland 1956 Ágústa Guðmundsdóttir after it was discovered that the latter was already married. Edith Noble Nakpil was replaced by Isabel Escobar Rodriguez as the representative of the Philippines due to undisclosed reasons.
Debuts, returns, and withdrawals This edition saw the debuts of the British Guiana, the Dominican Republic, Holland, and Iceland, and the returns of Turkey and Peru, which last competed in
1953 and
1954, respectively. Mirva Arvinen of Finland withdrew for undisclosed reasons. Ceylon, El Salvador, Honduras, Lebanon, Nicaragua, Norway, South Korea, and the West Indies withdrew after their respective organizations failed to hold a national competition or designate a contestant. == Results ==