The 1945–46 Rochester Royals season was the franchise's first season in the National Basketball League. This would also be considered the franchise's first official season as the Rochester Royals after previously being a mostly independent franchise that went by the name of the Rochester Seagrams all the way back in 1923 and then used the names of the Rochester Eber Seagrams and Rochester Pros in their last few seasons before utilizing the Rochester Royals name once they officially became a professional franchise. However, if those earlier incarnations are included, this season would represent the franchise's 23rd year of continuous play. This season was notable for the fact that the Royals would have the biggest victory in NBL history with a 70–27 blowout win on January 5, 1946, over the Youngstown Bears, who were also a new NBL team, though they would end up playing in that league for only one more season before folding operations altogether. They would also win their only NBL championship during that season. The Royals would later win an NBA Finals championship five years later in 1951 after they later moved out into the National Basketball Association, with the franchise now currently going by the Sacramento Kings.