Teresa Hsu Chih (7 July 1898 – 7 December 2011), or commonly known as Teresa Hsu (Chinese: 许哲; pinyin: Xǔ Zhe) was a Chinese-born Singaporean social worker, known affectionately as "Singapore's Mother Teresa", in recognition for her active lifelong devotion in helping the aged sick and destitutes locally. The retired nurse was the founder of the non-profit charities—Heart to Heart Service and the Home for the Aged Sick, one of the first homes for the aged sick in Singapore.