| 2013 Korea Yakult 7even Baseball [1] | |
| League: | Korea Professional Baseball |
| Sport: | Baseball |
| Duration: | March 2013 – November 2013 |
| No Of Teams: | 9 |
| No Of Games: | 128 per team |
| Season: | Regular Season |
| Season Champs: | Samsung Lions |
| Mvp: | Park Byung-ho (Nexen) |
| Mvp Link: | KBO League Most Valuable Player Award |
| Playoffs: | Postseason |
| Conf1: | Semi-Playoff |
| Conf1 Champ: | Doosan Bears |
| Conf1 Runner-Up: | Nexen Heroes |
| Conf2: | Playoff |
| Conf2 Champ: | Doosan Bears |
| Conf2 Runner-Up: | LG Twins |
| Finals: | Korean Series |
| Finals Link: | 2013 Korean Series |
| Finals Champ: | Samsung Lions |
| Finals Runner-Up: | Doosan Bears |
| Finals Mvp: | Park Han-yi (Samsung) |
| Finals Mvp Link: | Korean Series Most Valuable Player Award |
| Seasonslist: | List of KBO League seasons |
| Seasonslistnames: | KBO |
| Prevseason Link: | 2012 Korea Professional Baseball season |
| Prevseason Year: | 2012 |
| Nextseason Link: | 2014 Korea Professional Baseball season |
| Nextseason Year: | 2014 |
The Korea Professional Baseball season was the 32nd season in the history of the Korea Professional Baseball. The Samsung Lions won the regular season and Korean series.
For the 2013 season, due to the admission of the NC Dinos as the KBO's ninth team, each team's schedule was reduced from 133 games to 128 games during the regular season with the new schedule arranging for each team to play every other team 16 times.[2]
On 19 July, the best players in the KBO participated in the Korean All-Star game at Pohang Baseball Stadium. The franchises participating were divided into two regions: Eastern League (Samsung Lions, Doosan Bears, Lotte Giants, SK Wyverns) and Western League (Kia Tigers, Hanwha Eagles, LG Twins, Nexen Heroes, NC Dinos). The titles 'Eastern' and 'Western' do not directly correspond to the geographical regions of the franchises involved, as both SK and Doosan, being from Incheon and Seoul respectively, are based in the Western region of Korea, despite representing the Eastern League. Unlike in Major League Baseball, the Korean All-Star Game does not determine home-field advantage in the Korean Series. The 2013 Korean All-Star Game was won by the Eastern League, 4–2.
The 2013 Korea Professional Baseball season culminated in its championship series, known as the Korean Series. The top four teams qualified for the postseason based on their records. The team with the best record gained a direct berth into the Korean Series, while the other three teams competed for the remaining spot in the Korea Series in a step-ladder playoff system:
Unlike the regular season, no playoff game can result in a draw so each series can be completed as it was intended to be, whether it be a best-of-five-game or best-of-seven-games series.
| Rank | Team | GP | W | D | L | Pct. | Postseason |
| 1 | 128 | 75 | 2 | 51 | 0.595 | 2013 Korean Series Champion | |
| 2 | 128 | 74 | 0 | 54 | 0.578 | Playoff Loser | |
| 3 | 128 | 72 | 2 | 54 | 0.571 | Semi-Playoff Loser | |
| 4 | 128 | 71 | 3 | 51 | 0.568 | Semi-Playoff & Playoff Winner, 2013 Korean Series Runner-up | |
| 5 | 128 | 66 | 4 | 58 | 0.532 | Did not qualify | |
| 6 | 128 | 62 | 3 | 63 | 0.496 | ||
| 7 | 128 | 52 | 4 | 72 | 0.419 | ||
| 8 | 128 | 51 | 3 | 74 | 0.408 | ||
| 9 | 128 | 42 | 1 | 85 | 0.331 | ||
For the second straight year, there are no foreign hitters in the KBO, as all nine teams use their foreign player allotments on pitchers.