Sick's Stadium, also known as Sick's Seattle Stadium and later as Sicks' Stadium, was a baseball park in the northwest United States in Seattle, Washington. It was located in Rainier Valley, on the NE corner of S. McClellan Street and Rainier Avenue S. The longtime home of the Seattle Rainiers of the Pacific Coast League (PCL), it hosted the expansion Seattle Pilots during their only major league season in 1969.

The Seattle Rainiers, originally named the Seattle Indians and also known as the Seattle Angels and, during 1919, the Seattle Purple Sox, were a Minor League Baseball team in Seattle, Washington, that played in the Pacific Coast League from 1903 to 1906 and 1919 to 1968. They were initially named for the indigenous Native American population of the Pacific Northwest, and changed their name after being acquired by the Rainier Brewing Company, which was in turn named for nearby Mount Rainier.