Mežio Hroudo Hreie (Oikan: Mežio Hroudo Hreie [ˈme̞.ʒə ˈhro̞u̯.də ˈhre̞.jə]; 1678–1745; 2804–2871 I.T.) was a Sunterian mathematician. He is most notable for his 1699 (2825 I.T.) discovery of imaginary numbers.