Horningsea Mariana
- Sire: Horningsea Sagittarius
- Dam: Horningsea Marya
- Date of Birth: 1967-11-4
- Colour: Red
- Pattern: Black mask
- Country (birth): United Kingdom
- Country (current): Canada
- Mrs Marna M Dods, United Kingdom
- Horningsea
- Mrs Florence Hogarth, Canada