Held on the equatorial plane of the Earth on the sunny island of Singapore, Quantum Thermodynamics (QTD) 2025 will cover the study of thermal processes at the quantum scale. This is the 2025 edition of the annual quantum thermodynamics conference: previous conferences have been held in Berlin (2013), Mallorca (2014), Porquerolles (2015), Erice (2016), Oxford (2017), Santa Barbara (2018), Espoo (2019), Barcelona (online, 2020), Geneva (online, 2021), Belfast (online, 2022), Vienna (2023), and Maryland (2024).