The 2018–19 National Basketball League (Czech Republic) season was the 26th season of the Czech NBL.
ČEZ Nymburk achieved their 16th consecutive title, this time without losing any game in the whole season.
After the end of the stage after the first split, the six teams from to top group and the two first qualified teams from the bottom group joined the play-offs.
The other four teams would play again home and away against themselves for avoiding the relegation.
Seeded teams played at home games 1, 2, 5 and 7, while the third place game where played with a best-of-three format, playing the seeded team the matches 1 and 3 at home, and the finals in a double-legged one.