| District School No. 3 | |
| Location: | Junction of NY 3 and County Rd. 57, Putnam Corners, Lyme, New York |
| Coordinates: | 44.0692°N -76.2383°W |
| Built: | 1875 |
| Added: | September 6, 1990 |
| Area: | less than one acre |
| Refnum: | 90001326 |
District School No. 3, also known as Putnam Schoolhouse, is a historic one-room school building located at Lyme in Jefferson County, New York. The schoolhouse consists of a -story, two-by-three-bay wood-frame main block constructed about 1875, and a 1-story, two-by-one-bay rear addition constructed about 1900. Also on the property is a double privy dating to about 1900.[1]
It was listed on the National Register of Historic Places in 1990.