| Belgian Second Division | |
| Founded: | 1948 |
| First: | 1948-49 |
| Country: | Belgium |
| Confed: | FIBA Europe |
| Divisions: | 14 |
| Promotion: | Pro Basketball League |
| Relegation: | Derde Nationale |
| Levels: | 2 |
| Domest Cup: | Belgian Cup |
| Champions: | Kortrijk Spurs (1st title) |
| Season: | 2022–23 |
The Top Division Men One (TDM1), also known as the Belgian Second Division or the Tweede Nationale, is the second level of men's basketball in Belgium and the highest amateur level in Flanders.[1]
The league features 14 teams and the champion has the right to promote to the Pro Basketball League (PBL).
| 1948/49 | Canter Schaarbeek | ||
| 1949/50 | Forestoise | ||
| 1950/51 | Bressoux | ||
| 1951/52 | Bavi Vilvoorde | ||
| 1952/53 | Saint Louis | ||
| 1953/54 | Mercurius BBC | ||
| 1954/55 | RSAC Liège | ||
| 1955/56 | Ontspanning | ||
| 1956/57 | Zaziko | ||
| 1957/58 | Ontspanning | ||
| 1958/59 | VG Oostende | ||
| 1959/60 | Bavi Vilvoorde | ||
| 1960/61 | Antwerp Giants | ||
| 1961/62 | Union SG | ||
| 1962/63 | FC Perron Liège | ||
| 1963/64 | Standard Luik Liège | ||
| 1964/65 | BBC Oxaco | ||
| 1965/66 | Gilly | ||
| 1966/67 | Hermes | ||
| 1967/68 | Avanti Brugge | ||
| 1968/69 | Athlon Ieper | ||
| 1969/70 | Okapi Aalst | ||
| 1970/71 | BCO Sunair Oostende | ||
| 1971/72 | BC Destelbergen | ||
| 1972/73 | BCO Oostende | ||
| 1973/74 | Prado Kortrijk | ||
| 1974/75 | Aalst | ||
| 1975/76 | Royal Fresh Air | ||
| 1976/77 | St Truiden BB | ||
| 1977/78 | SFX Verviers | ||
| 1978/79 | Rimelago Aarschot | ||
| 1979/80 | Antwerpse B.C. | ||
| 1980/81 | Ticino Merksem | ||
| 1981/82 | Frisa Kortrijk | ||
| 1982/83 | Maccabi Etterbeek | ||
| 1983/84 | Duvel Willebroek | ||
| 1984/85 | Standaard AHZ Leuven | ||
| 1985/86 | Avanti Brugge | ||
| 1986/87 | Imb Gent | ||
| 1987/88 | BAC Sijsele | ||
| 1988/89 | Spirou Monceau | ||
| 1989/90 | Brandt Kortrijk | ||
| 1990/91 | COB St Louis | ||
| 1991/92 | Good Year Aalst | ||
| 1992/93 | Avenir Namur | ||
| 1993/94 | Free Time Center Aarschot | ||
| 1994/95 | Duvel Willebroek | ||
| 1995/96 | OT Vilvoorde | ||
| 1996/97 | Power Wevelgem | ||
| 1997/98 | |||
| 1998/99 | KBC Leuven | ||
| 1999/00 | TEC Fléron | ||
| 2000/01 | BC Facom Damme | ||
| 2001/02 | Ins. Wilsele | ||
| 2002/03 | Ins. Wilsele | ||
| 2003/04 | Saeco Union Hutoise | ||
| 2004/05 | RR BC Bruxelles | ||
| 2005/06 | Okapi Aalstar | Power Wevelgem | |
| 2006/07 | Gent Dragons | Sint-Jan Antwerpen | |
| 2007/08 | CEP Fleurus | Sint-Jan Antwerpen | |
| 2008/09 | BBC Bree | ||
| 2009/10 | BBC De Westhoek Zwevezele | BBC Kangoeroes Boom | |
| 2010/11 | BBC Kangoeroes Boom | BBC De Westhoek Zwevezele | |
| 2011/12 | Gembo BBC | Bent schoenen Waregem | |
| 2012/13 | Gembo BBC | BBC Kangoeroes Boom | |
| 2013/14 | Bent schoenen Waregem | Gembo BBC | |
| 2014/15 | Gembo BBC | Bent schoenen Waregem | |
| 2015/16 | Bent schoenen Waregem | Cuva Houthalen | |
| 2016/17 | Gent Hawks | Bent schoenen Waregem | |
| 2017/18 | Duva BC Gistel-Oostende | Gembo BBC | |
| 2018/19 | Oxaco BBC[2] | Bent schoenen Waregem | |
| 2019/20 | Melco Ieper | Gent Hawks | |
| 2020/21 | |||
| 2021/22 | BC GUCO Lier[3] | Kortrijk Spurs | |
| 2022/23 | Kortrijk Spurs[4] | LDP Donza | |
| 2023/24 | LDP Donza[5] | BBC Falco Gent | |