List of Famous people who died at 66

Marlene Catzín Cih was a Mexican politician affiliated with the Institutional Revolutionary Party (PRI). She was the Mayor of Maxcanú, Yucatán, from 1994–1995, 2010–2012 and from 2018 until her death in office in 2020.

Karim Dzhamalovich Kamalov, also spelled Karim Djamalovich Kamalov, was an Uzbek politician. He served as the Hokim, or Mayor, of Bukhara from 1997 until 2011 and again from August 2017 until February 2020. On 29 February 2020, Kamalov was appointed as acting Khokim of Bukhara Region, a gubernatorial office he held until his death on 22 August 2020, from COVID-19 during the COVID-19 pandemic in Uzbekistan. The Khokim is the equivalent of a regional governor in Uzbekistan.

Jean-Louis Loday was a French mathematician who worked on cyclic homology and who introduced Leibniz algebras and Zinbiel algebras. He occasionally used the pseudonym Guillaume William Zinbiel, formed by reversing the last name of Gottfried Wilhelm Leibniz.