Oleksandr Mykolayovych Haydash (; Aleksandr Nikolaevich Gaydash (); born 7 August 1967 in Zhdanov (now Mariupol), Ukrainian SSR) is a former Ukrainian (until 2014) and Russian (since 2014) professional football striker and current manager.
He played for FC Shakhtar Donetsk, SC Tavriya Simferopol and FC Metalurh Mariupol' in Ukraine and Sarñyer G.K. in the Turkish Süper Lig. He is one of the leading goal-scorer (95) in the Ukrainian Premier League. He also scored 62 goals in the Soviet championship for SC Tavriya Simferopol.
Haydash made two appearances for the Ukraine national football team.
After the annexation of Crimea to Russia he took Russian citizenship. Under the russified name Aleksandr Gaydash in 2014 he became a general director of TSK Simferopol.
He is the father of Andriy Gaydash.