Assuming "see" means with the naked eye:
1. The Sun: This is the most obvious and dominant object in our solar system.
2. The Moon: Our natural satellite is visible at night.
3. Planets: Depending on the time of year and position in the sky, you can see Mercury, Venus, Mars, Jupiter, and Saturn without a telescope.
If we allow for "seeing" with telescopes:
4. Other planets: All eight planets in our solar system can be observed with powerful telescopes.
Let me know if you want to explore other ways of interpreting the question!