Chadwick Square Diner or Worcester Lunch Car Company Diner #660 or Ralph's Chadwick Square Diner is a historic diner at 95 Prescott Street (rear) in Worcester, Massachusetts.
It was built by Worcester Lunch Car Company and added to the National Register of Historic Places in 2003. The Chadwick Square Diner was built for the original owners, Robert and Mamie Gilhooly of Worcester. The neon "G" on the front of the diner stands for Gilhooly and hopefully will always remain there in their honor. It was first located in the Chadwick Square section of Worcester and was a popular place for many of Bob's Worcester police officer friends to frequent. After Bob's passing, it was purchased by Bob's cousin Mary Ryan Clingen and her husband James Clingen of Cherry Valley, before it was moved near to the Worcester Leicester line. It was purchased so Mary and Jim's son-in-law and daughter, Ralph and Eileen Dryden could run it. After many years of making payments to the Clingens, the diner was finally paid in full by Ralph, just before he and Eileen divorced. It was later sold to Ralph Moberly and moved to its present location.