|Location||Providence, Rhode Island, USA|
|Altitude||226 feet (69 m)|
|Weather||See the Clear Sky Chart|
The Ladd Observatory is an astronomical observatory of Brown University in Providence, Rhode Island, USA. The observatory was dedicated in 1891 and is named for benefactor Herbert W. Ladd who funded the construction.
The main telescope is a 12-inch (30 cm) refractor with a lens made by John Brashear following the design of Charles S. Hastings. The equatorial mount and mechanical clock drive were made by George N. Saegmuller.
- Arnold N. Robinson & Carla Swanson (June 6, 2000). "National Register of Historic Places Registration Form: Ladd Observatory (including accompanying 5 photos, from 1992)" (pdf). National Park Service.
- "National Register Asset Details". The Focus Digital Asset Management System. National Park Service. Retrieved 6 February 2016.
- Mitchell, Martha (1993). "Ladd Observatory". Encyclopedia Brunoniana. Providence, RI: Brown University Library.
- Loucks, Donovan K. (29 March 2006). "H.P. Lovecraft's Interest in Astronomy". The H.P. Lovecraft Archive. Retrieved 7 January 2016.
- Donnelly, Marian Card (Winter 1960). "Astronomical Observatories in New England". Old-Time New England. Society for the Preservation of New England Antiquities. 50 (179): 72–80. Retrieved 7 January 2016.