John "Ace" Merrill
|Location:||Jerusalem's Lot, Maine|
Star Gazer Motel
|Known relatives:||Reginald Merrill|
|1st appearance:||"Let the River Run"|
John "Ace" Merrill is a fictional business owner & landlord, and an antagonist featured on the Hulu original series Castle Rock. He is associated with season two of the program and and was played by actor Paul Sparks. He first appeared in the season premiere, "Let the River Run".