Lillie Park is a 148 acre Pittsfield Township park at Platt Road at Ellsworth Road. It is a reclaimed gravel pit nestled to one side of the I-94/US-23 interchange, and has soccer fields, two fishing docks, and miles of interpretive nature trails.

The park was named after Pittsfield Supervisor Robert A. Lillie who served in office from 1970-1983. He was an advocate for acquiring the property in order to make it a park. The first land acquisition for the park occurred in 1983, with park development happening in stages between 1998 and 2003. The final, 24-acre triangular center piece was purchased in 2007 for $891,650. This acquisition generally united the park, but for an abandoned rail right-of-way (most recently the New York Central Ypsilanti branch) that still runs diagonally through the property.

There is a dog waste station, as well as bathrooms for humans, at the parking area for Haven Lake (closest the Platt and Ellsworth intersection).

Park hours are posted as "dawn to dusk" on a sign at an entrance to the Haven Lake parking lot.