Mary Hart is an American television personality.

Mary Hart may also refer to:

• Mary Theresa Hart, American artist and illustrator
• Mary Seymour, possible married name Mary Hart, daughter of Catherine Parr and Thomas Seymour
• Mary de Vere, married name Mary Hart, English noble
• Lynne Roberts, American actress, also credited as Mary Hart
• The Mary Hart Show, a fictional talk show which stars Mary Hart as the title role within the ABC Family comedy show Baby Daddy