Elite Squad: The Enemy Within (Portuguese: Tropa de Elite 2 – O Inimigo Agora é Outro, lit. ''Elite Troop 2: The Enemy is Now Another''; also known as Elite Squad 2) is a 2010 Brazilian action thriller film directed and co-produced by José Padilha, who co-wrote it with Bráulio Mantovani and Rodrigo Pimentel. The sequel to 2007's Elite Squad, it furthers the plot of a semi-fictional account of BOPE, the special operations force of the Rio de Janeiro Military Police, with a focus on the relationship between law enforcement and politics. The film was released in Brazil on October 8, 2010.

Like its predecessor, the film was met with critical acclaim and became the largest box office ticket seller and highest-grossing film of all time in Brazil, ahead of Dona Flor and Her Two Husbands and Avatar, respectively. It was selected as the Brazilian entry for the Best Foreign Language Film at the 84th Academy Awards, but did not make the final shortlist.