Donja Suvaja () is a village in Croatia.
According to the 2011 census, Donja Suvaja had 53 inhabitants.
<small>Note: Settlements of Donja Suvaja and Gornja Suvaja are independent settlements from 1890. Before they were part of former settlement of Suvaja. It include data for that former settlement 1857-1880.</small>
According to the 1991 census, settlement of Donja Suvaja had 153 inhabitants, which were ethnically declared as this:
According to the 1910 census, settlement of Donja Suvaja had 685 inhabitants in 3 hamlets, which were linguistically and religiously declared as this: