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.

The Pacific Coast League (PCL) is a Minor League Baseball league that operates in the Western United States. Along with the International League, it is one of two leagues playing at the Triple-A level, which is one grade below Major League Baseball (MLB).