Starting in the 1990s, reforms aimed at addressing the underrepresentation of women have been implemented in Colombia. However, research on the consequences of these reforms has been inconclusive. This article analyzes the influence of institutional variables on the proportion of nominated and elected women in Colombia between 1962 and 2014, at both the national and local levels of government, in three different institutional environments. Results confirm the influence of institutional change, indicating that decentralizing reforms and the introduction of the gender quota have had a positive impact on the proportion of women's candidacies and elections, but that the adoption of the open list negatively affected the percentage of elected women.