| Honorific-Prefix: | Diwan Bahadur |
| Muthiah Chidambaram Pethachi Chettiar | |
| Birth Date: | 1889 |
| Birth Place: | Kanadukathan, Madras Presidency |
| Death Date: | 1924 (age 35) |
| Death Place: | Madras |
| Nationality: | Indian |
| Occupation: | Landlord |
Diwan Bahadur Muthiah Chidambaram Pethachi Chettiar (1889–1924) was an Indian administrator who served as the second zamindar of Andipatti, succeeding his father S. Rm. M. Chidambaram Chettiar.
Muthiah Chettiar was born on 8 February 1887 to S. Rm. M. Chidambaram Chettiar, the second son of philanthropist Sattappa Ramanatha Muttaiya Chettiar. He was a nephew of Ramaswami Chettiar, founder of the Indian Bank and Sir Annamalai Chettiar, the first Raja of Chettinad and founder of the Annamalai University.