The following is a list of deaths that should be noted in October 2019. Names under each date are noted in the order of the alphabet by last name or pseudonym. Deaths of non-humans are noted here also if it is worth noting.
Ding Shisun, 92, Chinese mathematician and politician, President of Peking University (1984–1989), Chairman of the China Democratic League (1996–2005) and Vice Chairperson of the National People's Congress (1998–2008).[78]
Hevrin Khalaf, 35, Syrian politician and activist, Secretary General of the Kurdish Future Movement in Syria, shot.[79]
Cacho Castaña, 77, Argentine singer-songwriter, actor (Merry Christmas) and composer (Los Hijos de López, El Cabo Tijereta), problems caused by COPD.[97]
Hossein Dehlavi, 92, Iranian composer (Mana and Mani), problems caused by Alzheimer's disease.[98]
Nicolás Díaz, 90, Chilean politician and cardiologist, member of the Christian Democrat Party of Chile (PDC) and Mayor of Rancagua (1963–1964, 1967–1968).[115]
Taras Kutovy, 43, Ukrainian politician, member of Verkhovna Rada (2012–2014) and Minister of Agrarian Policy and Food (2016–2018), helicopter crash.[138]
Til Gardeniers-Berendsen, 94, Dutch politician, Minister of Health (1981–1982), MP (1971–1977, 1981–1983) and member of the Council of State (1983–1995).[142]