Oleksandr Valeriiovych Lytvynenko (; born 27 April 1972) is a Ukrainian politician, who has served as the Secretary of the National Security and Defense Council of Ukraine from 2024 to 2025. Headquarters Coordinator of the Headquarters of the Supreme Commander-in-Chief.
From 4 April 2014 to 13 August 2019, he served as the Deputy Secretary of the National Security and Defense Council of Ukraine.
From 13 August 2019 to 23 July 2021, he was the director of the National Institute for Strategic Studies.
On 23 July 2021, he was appointed as the head of the Foreign Intelligence Service. Since 27 July 2021, he was a member of the National Security and Defense Council of Ukraine.
On 26 March 2024, president Volodymyr Zelenskyy appointed Lytvynenko as the Secretary of the National Security and Defense Council. He was replaced by Rustem Umerov on 18 July 2025.