[1] The nationwide constituency for the 102-member Senate was contested, as well as the 166 seats of the House of Representatives, plus the delegates to the Andean Parliament.

[3][4] The elections were notable for the decision by former president Álvaro Uribe to stand for the Senate, the first ex-president in modern Colombian history to run for Congress afterwards.

[5][6] Uribe is constitutionally barred from standing for president again, having already served two terms.

Both senators and representatives are elected to four-year terms however the electoral system differs.

The House of Representatives uses proportional representation with the departments serving as constituencies, each electing from between 2 and 18 members.