When Palestinians went on hunger strike in 2017 against worsening conditions in Israeli prisons, Irish activists (and, more specifically, Republican prisoners in Northern Ireland) were one of the largest contingents of international supporters. This link was not unprecedented; though Irish-Palestinian solidarity has maintained a political presence since the mid-1970s, its publicity was elevated in 1981 when Palestinian prisoners in Israeli jails were among the first internationals to express solidarity with the Republican prisoners on hunger strike in Northern Ireland. Considering the deep settler colonial histories of both Ireland and Palestine as well as their connection as subjects of British colonial rule, this sense of solidarity is no surprise. However, Irish-Palestinian solidarity is often framed as simply an understanding of similar experience, when in fact its foundation runs much deeper. Rooted in the literature on transnationalism, solidarity, and social movements, this paper argues that Irish-Palestinian solidarity goes beyond support based on shared experiences to a deeper level of transnational solidarity built upon extensive understanding by both parties of global power structures of settler colonialism. With a specific focus on the Irish hunger strikes of 1981 and the Palestinian hunger strikes of 2017, it develops this argument in three main parts. First, it seeks to understand the historical roots of Irish-Palestinian solidarity and the ways in which local and shared histories provide a basis for solidarity. Second, it seeks to highlight how Irish and Palestinian hunger strikers understand the linkages between their struggles, moving beyond an idea of shared experience to that of united (or, one) struggle. Third, it looks to the future in order to understand how Irish-Palestinian solidarity — and transnational solidarity more broadly — can contribute to our collective liberation. The theoretical underpinnings of this paper are informed by theories of solidarity by Featherstone (2012), Kelliher (2018), Brecher et al (2000), Sundberg (2007), and Routledge and Cumbers (2009); theories of transnationalism by Keck and Sikkink (1998), Allen (2018), Salem (2018), and Louvet (2016); and social movement theory through the framework put forth by Tilly (1999), Tarrow (1998), and Beinin and Vairel (2013). This dissertation will situate itself within the literature on transnational solidarity, intervening via an understudied but deeply relevant case. It will construct this case by analyzing primary sources, including but not limited to prisoner solidarity statements, prison writings, street art, and interviews with prisoners.