Is mr Jones a proper noun?

Mr. Jones is a proper noun.

Nouns refer to people, places, and things. Nouns can be divided into proper nouns and common nouns. Proper nouns are names for specific people, places, events, and things, such as Empire State Building, Hudson Bay, Robin Hood, and the Pythagorean Theorem, and are capitalized. Common nouns are nouns that refer to types of people, places, and things, such as baby, street, software, and childhood, and are not capitalized except at the beginning of a sentence. Mr. Jones is a proper noun because it refers to a specific person, and thus should be capitalized.