- Atop
- On
- Above
- Over
- Concerning
- Regarding
- After
- Following
- As for
- In the wake of
- In light of
- In connection with
- With respect to
- Based on
- Close to
- About
- Against
- Near
- At the time of
- During
- Subsequently
- In relation to
- Immediately after
- As soon as
- On top of
- In the presence of
- On the subject of
- In the midst of
- In view of
- In consideration of
Example Sentences of Upon
1. Upon arrival, we started exploring.
2. He relied upon her support completely.
3. She smiled upon seeing her friends.
4. They decided upon a new strategy.