Charles O'Brien was the 7th Viscount Clare was born in 1757 in Paris, France, the son of Charles O'Brien, 6th Viscount Clare and Marie Genevieve Louise Gauthier. O'Brien died unmarried on 29 December 1774 in Paris, France.
| Peerage of Ireland | ||
|---|---|---|
| Preceded by Charles O'Brien |
— TITULAR — Earl of Thomond 1761-1774 |
Succeeded by Extinct |
| — TITULAR — Viscount Clare 1761-1774 |
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