Rede Sigma, commonly known as just Sigma, is a Palesian commercial television network, being launched on April 26th, 1965 by businessman and journalist Norberto Moitinho, then-owner of sister newspaper O Sigma and sister radio station Rádio Sigma.

It is headquartered in Rio de Sineiro, with additional operations being held in São Gonçalo, aside from additional owned-and-operated stations in Novo Horizonte (Minas dos Campos), Calênsia (Distrito Federal) and Arrecife (Fernambuco), being owned by Grupo Sigma.

It is the country's largest and most watched television network, although it has also been criticized for its near monopolistic dominance in the media landscape, its quality decline over the years and its bias towards the Palesian Social Democracy Party (previously supporting the Military Regime that lasted from 1964 until 1985).

Its primary competitors are TelecordTV, EPT, Rede Viseirantes, Telerede and TV Educativa.

1965-1966

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1966-1976

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1969-1970

1970-1976

1970-1972

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1972-1976

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1975 (10th anniversary)

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1975 (unused)

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1975-present

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1975-1981

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1980 (15th anniversary)

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1979-1982

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1980-1983

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1983-1985

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1984-1986 (20th anniversary)

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1985-1992

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1989-1991

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1989-1991 (25th anniversary)

1990-1992

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1991 (26th anniversary)

1992-1996

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1994-1996

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1994-1996 (30th anniversary)

1996-2000

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2000-2005

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2005-2008

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2005 (40th anniversary)

2008-2014

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2010 (45th anniversary)

2011-2014

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2014-2015

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2015-present

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2015 (50th anniversary)

2020 (55th anniversary)

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2021 (tentative)

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Broadcast television networks in Palesia
Major broadcast networks:
Rede Sigma | TelecordTV | EPT | Rede Viseirantes | Telerede | TV Educativa

Minor broadcast networks:
TV Palésia | Canal Ensina | Rede 21 | Rede Familiar |