Joseph Luechai Thatwisai (born December 2, 1962, Thai: ลือชัย ธาตุวิสัย; rtgs: Lue-chai Thatwisai) is appointed Roman Catholic Bishop of Udon Thani diocese.
Joseph Luechai Thatwisai was ordained a priest in 1990. He obtains a pontifical degree in Scripture and was professor of biblical theology at Thailand's Saeng Tham National Major Seminary from 2000 to 2006. Afterwards he earned a PhD in biblical studies at the Catholic Institute of Paris. Since 2008 he was secretary of the Thai bishops’ Catholic Commission for the Bible commission.