Ignacije Szentmartony (October 28, 1718 – April 15, 1793) was a Croatian Jesuit priest, missionary, mathematician, astronomer, explorer and cartographer.
[1] Szentmartony was born in Kottori, Kingdom of Hungary (today Kotoriba,[2] Međimurje, Croatia), to a Croat mother and a Hungarian father.
Based on his surveys, Lorenz Kaulen made in 1753 a map of Maranhão district titled Mappa Viceprovinciae Societatis Iesu Maragnonii anno MDCCLIII concinnata.
Upon the data obtained from his systematical astronomical surveys, in 1755 engineers Schwebel and Sturm made a regional map titled Mappa Geographico dos Rios.
[2] He is also believed to be the author of Einleitung zur kroatischen Sprachlehre für Teutschen, the first Kajkavian grammar, published in 1783 in Varaždin.