The 2020 Pacific League Climax Series (PLCS) was Nippon Professional Baseball's (NPB) playoff series to decide which Pacific League (PL) team would advance to the 2020 Japan Series. Due to the COVID-19 pandemic, the PL decided to modify the traditional Climax Series format and eliminate the First Stage series to instead only play one modified Final Stage series: a best-of-five series, with the PL champion receiving an automatic one-win advantage over the league's runner-up. The Fukuoka SoftBank Hawks, the league's champion, competed against runner-up Chiba Lotte Marines to determine who would advance to the 2020 Japan Series. The series was played from November 14 to 15 at Fukuoka PayPay Dome. With the advantage and two consecutive come-from-behind wins, the Hawks advanced past the Marines