| Honorific-Prefix: | Diwan Bahadur |
| S.RM.M. Ramaswami Chettiar | |
| Order1: | Member of Madras Legislative Council |
| Term Start1: | December 1909 |
| Term End1: | 1912 |
| Birth Date: | 1872 |
| Death Date: | 5 November 1918 (age 46) |
| Death Place: | Madras |
| Nationality: | Indian |
| Profession: | Businessman |
| Occupation: | Legislator |
Diwan Bahadur Satappa Ramanatha Muthiah Ramaswami Chettiar (1872 – 5 November 1918) was an Indian businessman from what is now the state of Tamil Nadu.
Ramaswami Chettiar was born in 1872 to S.RM.Muthiah Chettiar of Kanadukathan, Chettinad. who was well known for his philanthropic activities. Muthiah Chettiar had renovated Nataraja temple at Chidambaram. Ramaswami was the second son of Muthiah Chettiar. His younger brother was Raja Sir Annamalai Chettiar.
In 1906, the Arbuthnot Bank, the biggest banking institution in Madras City, crashed leaving thousands penniless. As a result, the idea of an Indian-owned bank was floated. The Indian Bank eventually came into being the very same year. Ramaswami Chettiar was one of the founder-directors of the bank.
In 1907, Ramaswamy Chettiar resigned and was succeeded as director by his younger brother Annamalai Chettiar.
In 1912, Ramaswami Chettiar donated rupees one lakh to the Chidambaram Municipal Board for the construction of water works in the town. Ramaswami Chettiar established the Ramaswami Chettiar Town High School in Chidambaram in 1915.
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