Your letters of recommendation should be written by people who have evaluated you and can write objectively about your aptitudes and capabilities in an academic or work setting – for example, current or former advisors, instructors or supervisors.
The title or position of the recommender is not as important as his/her ability to comment knowledgeably and specifically about you. If you do not have an academic reference or direct supervisor, consider clients (if you own a business), military personnel or community leaders.