Donor (noun)

1. A person who gives money, goods or time to a person or organization in need.
2. A person who contributes something, especially money, to a charity or other worthy cause.

Origin:

From latin donator, from donare ("to give as a gift").

Examples:

1. She is a regular donor to the charity.
2. He is a major donor to the university.
3. The donors gave money to help build the new hospital.
4. He is a blood donor.
5. The company is a proud donor to the local school district.