The Hundred of Para Wirra is a cadastral hundred of the County of Adelaide, South Australia, spanning a portion of the Adelaide Hills north of the Torrens Valley including Mount Crawford.

The hundred spans a large number of Adelaide Hills localities but is dominated by Kersbrook in the west and Mount Crawford in the east, with the Mount Gould Range forming a natural boundary between the two.

The hundred was proclaimed by Governor Frederick Robe in 1846 and named for an indigenous compound term meaning 'river forest' (compare: Karra wirra-parri).

The councils were established on the same day in 1854 to administer, respectively, the western and eastern halves of the hundred, with the Mount Crawford council area extending into the neighbouring Hundred of Barossa and slightly east outside the County of Adelaide boundaries.

In 1966, the Warren Conservation Park was created in the middle of the hundred on the northern slopes of Mount Gould Range.