Ex-LST (Landing Ship Tank) tank landing ships have been operated by various countries in their navies. These vessels are designed to transport and land troops, vehicles, and supplies directly onto shore. Here are some countries that have operated ex-LSTs:

1. United States: The US Navy has operated various classes of LSTs, particularly during and after World War II. Some of these ships have been transferred to allied nations.

2. United Kingdom: The Royal Navy has used LSTs, especially during World War II, and has had several classes of LSTs in service.

3. Australia: The Royal Australian Navy has operated LSTs, including the Charles F. Adams-class and others.

4. Canada: The Canadian Navy has used ex-LSTs, particularly during the mid-20th century.

5. India: The Indian Navy has operated LSTs, notably during the Indo-Pakistani wars.

6. Thailand: The Royal Thai Navy has also operated LSTs, some of which were acquired from the US.

7. Brazil: The Brazilian Navy has operated LSTs, using them for amphibious operations.

8. Philippines: The Philippine Navy has utilized ex-LSTs, including those acquired from the United States.

9. South Korea: The Republic of Korea Navy has operated LSTs, primarily for amphibious operations.

10. Greece: The Hellenic Navy has also operated LSTs as part of its naval fleet.

These countries have utilized ex-LSTs for various purposes, including amphibious warfare, logistical support, and humanitarian missions. The specific classes and numbers of ships can vary, and many of these vessels have been retired or replaced with modern alternatives over time.