| Cornelius Ahern | |
| Constituency Mp: | Indi |
| Parliament: | Australian |
| Predecessor: | Parker Moloney |
| Successor: | Parker Moloney |
| Term Start: | 31 May 1913 |
| Term End: | 5 September 1914 |
| Birth Date: | 1871 7, df=yes |
| Birth Place: | Victoria |
| Nationality: | Australian |
| Party: | Commonwealth Liberal Party |
| Occupation: | Solicitor |
Cornelius Joseph Ahern (10 July 1871 – 10 July 1955) was an Australian politician. Born in Victoria, he was educated at Xavier College in Melbourne and became a solicitor in Wangaratta. In 1913, he was elected to the Australian House of Representatives as the Liberal member for Indi, defeating the sitting Labor MP Parker Moloney. He was defeated by Moloney the following year, and retired from politics, becoming an insurance company director in Melbourne. Ahern died on his birthday in 1955.[1]