The 3rd league 2009/10 was the second season of the single-track 3rd league . It began on July 25, 2009 and ended on May 8, 2010 with the 38th and final matchday. Two weeks after the 3rd division, the Bundesliga and 2nd Bundesliga started the 2009/10 season.
After the 37th match day, FC Erzgebirge Aue was the first to be promoted to the 2nd Bundesliga . On the 38th matchday, VfL Osnabrück became champions as second climbers and thus managed to gain direct promotion. The FC Ingolstadt 04 prevailed as third in the table in the relegation against Hansa Rostock , the third from bottom of the 2nd Bundesliga. In principle, all clubs were eligible for promotion, with the exception of the four second representatives of Bundesliga clubs. The first four of the table were also automatically qualified for the first main round of the 2010/11 DFB Cup .
The two relegation games between the sixteenth in the 2nd Bundesliga and the third in the 3rd division took place on May 14, 2010 (8:30 p.m.) and May 17, 2010 (8:30 p.m.). FC Ingolstadt 04 won both games (1-0 and 2-0) and were promoted to the 2nd Bundesliga. Hansa Rostock was third class for the first time in the club's history.
Together with dfb.de , the internet platform fussball.de carried out an election for football player of the month for the first time this season. In the calendar months when the game was in play, the coaches of the 20 participating clubs nominated a total of five players, one of whom was voted player of the month via internet voting. At the end of the season, the monthly winners were then eligible for another internet vote for Player of the Year, with Björn Lindemann , who had previously won three of the eight Player of the Month titles, prevailed.
Dynamo Dresden had the highest average attendance with 14,440 visitors per game. As in the previous season, the second Bundesliga teams had the lowest attendance figures. The most popular game was the encounter between Dynamo Dresden and Carl Zeiss Jena on matchday 35 with 29,000 spectators. Only 260 spectators saw the game Bayern Munich II against SV Sandhausen on matchday 28.