| Office: | Senator |
| Term Start: | 8 September 1943 |
| Term End: | 18 August 1944 |
| Constituency: | Cultural and Educational Panel |
| Birth Date: | 24 December 1893 |
| Birth Place: | Liverpool, England |
| Death Place: | Dublin, Ireland |
| Party: | Independent |
Donal Joseph O'Sullivan (24 December 1893 – 15 April 1973) was an Irish academic, folk-music historian and politician.[1] He was an independent member of Seanad Éireann from 1943 to 1944. He was elected to the 4th Seanad in 1943 by the Cultural and Educational Panel.[2] He lost his seat at the 1944 Seanad election.[2] He was also a Clerk of the Seanad from 1922 to 1936.[2]