Objective: This article looks at whether political and selfefficacy predict the justifiability of political violence and terrorism. Methods: Utilizing the World Values Survey sample of 41,178 respondents from 31 countries, this article uses a mixed effect logistic regression with country-level random intercepts to answer the research question and test the hypothesis. Results: Self-efficacy predicts less support for political violence or justifiability of terrorism, and less political efficacy predicts less support for terrorism while not influencing political violence in a significant manner. The interaction between selfefficacy and economic insecurity was significant with high economic security and low self-efficacy predicting more justifiability of terrorism. Conclusions: Support is found for Saab et al. ( 2016) "gun and the olive branch" thesis. Specifically, being politically efficacious and finding conventional political activism efficacious does not reduce support for political violence. However, finding conventional activism efficacious makes one less likely to find terrorism justifiable. Support is also found for the prosocial effect of selfefficacy (Rottweiler and Gill 2020).Recent instances of political violence by right-wing perpetrators in the West such as mosque shootings in Christchurch, riot on the U.S. capitol, and attacks on synagogues in the United States have invigorated the debate around when political violence is justified. This is seen as a credible and urgent threat (Renshaw and Wolfe 2021). However, one area in this regard that researchers seem to only have begun scratching the surface of is the linkage between efficacy and support for political violence and terrorism as the political or ideological goal. While efficacy's effect on protest participation under repressive conditions has been studied by Ayanaian and Tausch (2016) and Ayanian et al. (2020) and on a wide range of countries by Corcoran, Pettinicchio, and Young (2011, 2015); no one, for the most part, seems to have asked the question if the less efficacious may end up supporting violent non-conventional political actions. Dr. Martin Luther King said that "riots are the language of the unheard" (Weber 2020), so there seems to be some understanding that lack of efficacy could lead to violence. For example, African Americans are likely to report lower 108