Primera B Metropolitana
|Number of teams||21|
|Level on pyramid||3|
|Promotion to||Primera B Nacional|
|Relegation to||Primera C|
|Domestic cup(s)||Copa Argentina|
|Current champions||Nueva Chicago
(7 titles each)
|TV partners||TyC Sports|
Primera B Metropolitana is currently organized so, during the course of a season, each club plays the others twice (a double round robin system), once at their home stadium and once at that of their opponents.
The team that gets the most points at the end of the season is recognized as the Primera B champion and is automatically promoted to Primera B Nacional. The teams that hold the second to fifth positions have the chance to enter the Torneo Reducido whose winner will be promoted.
The teams with the 2 lowest aggregate points total in Primera B Metropolitana are relegated to Primera C Metropolitana.
Current teams (2014-15 season)
List of champions
The tournament has received different names since its first edition in 1899, such as "Segunda División" (1899-1911; 1933-48), "División Intermedia" (1911-26), "Primera División B" (1927-32, 1949-1985). After the restructuring of the Argentine football league system, the tournament changed its name to "Primera B Metropolitana" becoming the third division. 
Titles by club
|Banfield||7||1899, 1900, 1919, 1939, 1946, 1962, 1973|
|Ferro Carril Oeste||7||1912, 1958, 1963, 1969, 1970, 1978, 2002-03|
|Chacarita Juniors||5||1924, 1941, 1959, 1993-94, 2014|
|Tigre||5||1912 FAF, 1945, 1953, 1979, 2004-05|
|Barracas Athletic||4||1901, 1902, 1903, 1904|
|Defensores de Belgrano||4||1914 FAF, 1917, 1967, 2000-01|
|Lanús||4||1950, 1964, 1971, 1976|
|Honor y Patria (B)||3||1914, 1926 AAm, 1929|
|El Porvenir||3||1920, 1927, 1997-98|
|Estudiantes (LP)||3||1911, 1935, 1954|
|Atlanta||3||1956, 1983, 2010-11|
|Quilmes||3||1949, 1961, 1975|
|All Boys||3||1972, 1992-93, 2007-08|
|Estudiantes (BA)||3||1906, 1977, 1999-2000|
|Nueva Chicago||3||1930, 1981, 2013-14|
|Rosario Central||3||1942, 1951, 1985|
|Nacional (Adrogué)||2||1907, 1926|
|Dock Sud||2||1921, 1932 AAF|
|Boca Juniors II [i]||2||1922, 1923, 1936|
|Liberal Argentino||2||1923 AAm, 1931 AAF|
|Talleres (RE)||2||1925 AAm, 1987-88|
|Argentinos Juniors||2||1940, 1955|
|Central Córdoba (R)||2||1957, 1990-91|
|Sarmiento (J)||2||1980, 2011-12|
|Deportivo Español||2||1984, 2001-02|
|Almirante Brown||2||2006-07, 2009-10|
|Gimnasia y Esgrima (BA)||1||1909|
|Gimnasia y Esgrima (LP)||1||1915|
|Barracas Central||1||1919 AAm|
|General Mitre||1||1920 AAm|
|River Plate II 1||1||1934|
|Argentino (S)||1||1922 AAm|
|Bella Vista||1||1934 AAF|
|Villa San Carlos||1||2012-13|
- Then renamed "Alumni AC", in 1901.
- Reserve teams of Primera División clubs which took part of the championship along with the clubs from the Second Division.
- The Federación Argentina de Football (FAF) was a rival association that organized its own championships from 1912 to 1914.
- Merged to Club Atlético Palermo, in 1920.
- The Asociación Amateurs de Football (Aam) was a rival association that organized its own championships from 1919 to 1926.
- The Asociación Argentina de Football (AAF) was a rival amateur association that organized its own championships from 1931 to 1934, when it merged with professional Liga Argentina de Football (LAF).
- In 1976 two tournaments were disputed, proclaiming one champion each. Both titles were official.
- The Federación Argentina de Football (FAF) was a rival amateur association that organized its own championships from 1912 to 1914