The Hundred of Onkaparinga is a cadastral hundred of the County of Adelaide, South Australia, in the Adelaide Hills. It was proclaimed by Governor Frederick Robe in 1846 and named for the Onkaparinga River valley, which flows from north east to south west through the hundred. The main towns within the hundred are Woodside, Lobethal, Balhannah and, on the southern fringe, Hahndorf. The Adelaide suburb of Crafers is another major population centre in the hundred.