The LST-542-class tank landing ships were originally built for the United States Navy during World War II. After the war, many of these ships were transferred to various navies around the world. Some of the navies that operated ex-LST-542-class ships include:

1. United States Navy - The original operator of the LST-542-class ships.
2. Royal Navy (United Kingdom) - Some of the ships were transferred to the British Royal Navy.
3. French Navy - Several LSTs were transferred to France and used in various capacities.
4. Italian Navy - Italy received some of these ships post-war.
5. Greek Navy - Greece operated several ex-LSTs.
6. Turkish Navy - Turkey received some of these ships as part of military aid.
7. Philippine Navy - The Philippines operated several ex-LSTs.
8. Republic of Korea Navy (South Korea) - South Korea received LSTs as part of military support.
9. Republic of China Navy (Taiwan) - Taiwan operated ex-LSTs.
10. Royal Thai Navy - Thailand also received some of these ships.

These vessels were often used for a variety of purposes, including transport, supply, and amphibious operations, reflecting their versatility and continued utility beyond their original design as tank landing ships.