Q: Can I use an HDMI monitor connected to my macbook pro? What adapter would I need?

What model MacBook Pro? There are adapters for pretty much everything.  You might want to check if audio is also transferred if you need that.

Hi Jerry313:

This is the cable I am using on my Macbook Pro Early 2011.

Thunderbolt to HDMI http://www.amazon.ca/gp/product/B00APLJ58M?psc=1&redirect=true&ref_=oh_aui_detai lpage_o05_s00

If your computer has an HDMI port you don't need any adapter. It would help us help you if you told us the model/year computer you have.