Thomas G. Cupillari Observatory is an astronomical observatory in Fleetville, Pennsylvania, owned and operated by Keystone College.

It is named after Thomas G. Cupillari, a professor of physics, mathematics, and astronomy at Keystone College, who founded it in 1973 after purchasing its dome and telescope from television personality Dave Garroway. Cupillari retired as a professor in 2007, stepped down as director of the observatory in 2015, and died of cancer in 2021.

• List of astronomical observatories

• Cupillari Observatory Clear Sky Clock Forecasts of observing conditions.