Henry Joseph Dabzac
portrait by Hugh Douglas Hamilton
Born	1737  Menorca
Died	12 May 1790  (aged 52–53)
Position held	Donegall Lectureship at Trinity College Dublin, Regius Professor of Greek, Regius Professor of Laws

Henry Joseph Dabzac (1737–12 May 1790) was an Irish academic.^[1][2]

Dabzac entered Trinity College Dublin (TCD) (1753), graduated BA (1757), and became a fellow (1760–75)^[2] and a senior fellow (1775–90). He was Donegall Lecturer in Mathematics (1764-1769) and gained his BD (1767) and DD (1772). He was Archbishop King's lecturer (1773, 1779), and gained his MA in 1760. He served as Regius Professor of Greek (1775–8) and Erasmus Smith's Professor of Modern History (1778–90) and concurrently was Regius Professor of Laws (1779–82).

In March 1774 he married Catherine Pigou and they had twelve children, of whom four died in infancy.^{[citation needed]}

Dabzac was the librarian at TCD from 1785 until his death.^[1]