Ewaldus Martinus Sedu (born 30 July 1963) is an Indonesian Roman Catholic bishop.

He continued his education in philosophy and theology at the Ledalero Catholic School of Philosophy after undergoing the Year of Spiritual Orientation at the Interdiocesan High Seminary of St. Peter Ritapiret, in Flores where he was elected as class president and general chairman.

[1] On 14 July 2018 it was announced that Sedu would be the next bishop of the diocese of Maumere, succeeding the retiring Gerulfus Kherubim Pareira.

On 26 September 2018 Sedu was consecrated by Pareira as the new bishop of Maumere in the Samador da Cunha Sport Center with more than 20,000 in attendance.

The co-consecrators were Vincentius Sensi Potokota, archbishop of Ende, and Franciscus Kopong Kung, bishop of Larantuka.