The four largest planets in our solar system, in order from largest to smallest, are:

1. Jupiter: The largest planet in our solar system. It is a gas giant with a diameter of 86,881 miles.

2. Saturn: The second largest planet, known for its prominent ring system. It has a diameter of 74,898 miles.

3. Uranus: An ice giant with a diameter of 31,518 miles.

4. Neptune: Another ice giant, with a diameter of 30,599 miles.