Baldwins Creek is a tributary of the Stony Brook in Mercer County, New Jersey in the United States.
Baldwins Creek starts at 40°20′26″N 74°49′17″W / 40.34056°N 74.82139°W / 40.34056; -74.82139, near Baldwin State Park. It flows east, flowing through Baldwin State Park and crossing Route 31 (Pennington Road). It flows through the Baldwin State Wildlife Management Area and joins Stony Brook at 40°20′21″N 74°46′41″W / 40.33917°N 74.77806°W / 40.33917; -74.77806.