What do you call someone that has a masters degree?

A master’s student is called a graduate student or “grad student” for short. A student still studying for a bachelor’s degree is called an undergraduate student or “undergrad student.”

Can you call someone with a masters degree Master?

Yes. If you graduate with a BSc or BA, you are a Bachelor of Science or a Bachelor of Arts respectively. Similarly if you graduate with a master’s, you are a master, and if you graduate with a doctorate you’re a doctor.
 

How do you address a masters degree?

The official title is “Master of xxx” for someone who has attained a Master’s degree in a given topic. I have also heard the phrase “Mistress of xxx” been used for a female; though I cannot speak to whether it is a traditional title.

Can you use Master as a title?

The use of Master as a prefixed title is, according to Leslie Dunkling, “a way of addressing politely a boy … too young to be called ‘Mister’.” It can be used as a title and form of address for any boy.

Why don’t we call people with Master’s degrees Master?

In the US it probably has to do with the ideals of freedom and equality. Master denotes authority, which some people automatically takes to mean superiority. Some people also seem to live in fear that people with college degrees look down on them.