| Martha Sarah Kahui Bragg | |
| Birth Name: | Martha Sarah Kāhui Isaac (Īhakara) |
| Birth Date: | March 30, 1895 |
| Birth Place: | The Neck, New Zealand |
| Death Place: | Masterton, New Zealand |
| Burial Place: | Kohunui cemetery |
| Nationality: | Māori |
| Occupation: | Child welfare worker farmer |
| Known For: | Voluntary child welfare work |
| Spouse: |
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| Mother: | Maryanne (Mereana) Louise Mapepe Isaac |
| Father: | Walter Bruce Joss |
Martha Sarah Kahui Bragg (30 March 1895 - 26 May 1975) was a New Zealand dairy farmer and a voluntary child welfare worker. Of Māori descent, she identified with the Ngai Tahu (South Island) iwi and is remembered for fostering or adopting many children, successfully raising 38 young people through her own efforts and actively supported by her Māori community.[1]