Line B (Czech: Linka B) is a line on the Prague Metro. Chronologically the third to open, it was first opened in 1985 and continued to expand in the 1990s. Currently it is the longest line in the network with 24 stations and 25.6 kilometres (15.9 mi) of track.
| Segment | Date opened | Length |
|---|---|---|
| Florenc-Smíchovské nádraží | November 2, 1985 | 4.9 km (3.0 mi) |
| Smíchovské nádraží-Nové Butovice | October 26, 1988 | 4.9 km |
| Florenc-Českomoravská | November 22, 1990 | 4.4 km (2.7 mi) |
| Nové Butovice-Zličín | November 11, 1994 | 5.1 km (3.2 mi) |
| Českomoravská-Černý Most | November 8, 1998 | 6.3 km (3.9 mi) |
| Hloubětín | June 8, 1999 | N/A |
| Kolbenova | June 26, 2001 | N/A |
| Total: | 24 stations | 25.6 km |
