Hendrik Adriaan Christiaan Dekker (1836, Amsterdam – 1905, Rheden) was a 19th-century Dutch painter and lithographer.
Dekker was a pupil of Charles Rochussen for painting and Johann Wilhelm Kaiser for engraving at the Rijksakademie van beeldende kunsten in Amsterdam. He was a member of the Pulchri studio and called himself Hein, but signed his works HAC Dekker. He made lithographs after Jozef Israëls.