2×4 Roller Derby

2x4 Roller Derby (also Dos por cuatro: /ˌˈdɒs ˈpɒr ˈkwæˈtrɒ/) is a women's flat track roller derby league based in Buenos Aires, Argentina. Founded in 2010, the league consists of three teams that play against each other: Bully Chicks, Cowgirls From Hell and Bloody Furias. It is also represented by three travel teams (Team Osom, Lxs Pibxs and Team C) that play against travel teams from other leagues.

The name 2x4 is a reference to Tango, the typical music genre of Buenos Aires. In technical terms, Tango has binary form (theme and chorus) and a quadruple compass, so in Argentina it is known as "the two by four" (in Spanish: "dos por cuatro"). Hence, 2x4 Roller Derby.

2x4 Roller Derby is a member of the Women's Flat Track Derby Association (WFTDA), and as of October 2019, ranked 10th in the world as per WFTDA rankings.

In 2019, 2x4 became the first team from Latin America to qualify for WFTDA Championships.