That looks like maybe the rear main seal (hard to tell from just the one photo).

Is your engine oil, or your AT fluid going down? Monitor to identify which one is leaking.

 

Rear main seal more than likely.
Also from the looks of the picture there is oil allover the area. Leaks from above can work down the casings to those areas and mimic leaks from that area. First you need to get a few can of Brake parts cleaner and rinse off everything to be able to pinpoint that or other issues when new oil appears. Could be valve cover, cam sensor seal and so on leaking downward.
After that try Blue Devil Rear main sealer additive next oil change along with 5w-40 full synthetic vs 5w-30 which I assume you are using. If it doesn't stop within 1500-2000 miles then you will need a rear main seal replacement if no other leaks are found from area rinse off.
Monitor oil/ATF levels as suggested.

 

Distributor o ring ? Mine was running off transmission and wasn't on engine oil pan

 

Spray al lthat down with some brake cleaner then you can get a clearer idea of whats leaking.... pray it aint the rear seal though....