The Catharine Roynane Three-Decker is a historic triple decker house at 18 Ingalls Street in Worcester, Massachusetts. It was built c. 1890, and is a well-preserved local example of Queen Anne styling. This styling survives principally in the woodwork frieze on the porch, and its flanking projecting polygonal bay with skirting below the second and third floor windows. Other details, including bracketing in the eaves an dvertical board finish on the projecting bay, have been lost or obscured due to residing. The house was listed on the National Register of Historic Places in 1990.