Q: printer for El Capitan

See here for some information on compatible printers

Printer and scanner software available for download for your Mac - Apple Support

OS X El Capitan: Add or remove a printer

About AirPrint - Apple Support

You could also look at vendor sites, e.g.

http://support.lexmark.com/index?page=content&id=OS22&locale=EN&userlocale=EN_US

http://support.hp.com/us-en/document/c04473034

https://www.usa.canon.com/internet/portal/us/home/support/self-help-center/Mac-O SX-Compatibility/

http://support.brother.com/g/s/os/mac/

Annanan wrote:

 

I have El Capitan on my IMAC and would like to know what printers are compatible

Unless you are looking for some kind of odd or specialized feature, the answer is pretty much all of them.

Search for printers based on features which are important to you (cost of ink refills, paper size, printer size, price, etc) and >99% of the ones that you find will be compatible.