| Birth Date: | 1879 |
| Death Date: | 11 September 1952 |
| Sir William Cosgrave | |
| Office: | Chief Commissioner of the Andaman and Nicobar Islands |
| Term Start: | 1935 |
| Term End: | 1938 |
| Honorific Suffix: | CIE |
Sir William Alexander Cosgrave, CIE (1879 – 11 September 1952) was a British administrator in India. A member of the Indian Civil Service, he was Chief Commissioner of the Andaman and Nicobar Islands from 1935 until 1938.
The son of H. A. Cosgrave, JP, of County Dublin, William Cosgrave was educated at Shrewsbury School and Trinity College, Dublin, where he was a classical scholar. He passed into the Indian Civil Service in 1903 and was posted to the Bengal.
Cosgrave was appointed a CIE in 1931 and was knighted in 1938.[1]