Mary Augusta may refer to:
- Mary Augusta Hickey (1887âÂÂ1923), American wife of P. J. Kennedy
- Mary Augusta Mullikin (1874âÂÂ1964), American painter
- Mary Augusta Safford (1851âÂÂ1927), American Unitarian minister
- Mary Augusta Stewart Houston, birth name of Stewart Bagnani (1903âÂÂ1996), Canadian administrator
- Mary Augusta Tappage (1888âÂÂ1978), Shuswap-Métis elder, midwife, and storyteller
- Mary Augusta Wakefield (1853âÂÂ1910), British composer, contralto, festival organiser, and writer
- Mary Augusta Yohé (1866âÂÂ1938), American musical theatre actress