Mieczysław (Polish pronunciation: [mʲɛtʂɨˈswaf]) or Mečislovas (Lithuanian) is a Slavic name of Polish origin. Feminine form: Mieczysława.

This name may refer to:

• Mečislovas Birmanas (1900–1950), Lithuanian chess player
• Mečislovas Davainis-Silvestraitis (1849–1919), Lithuanian activist
• Mečislovas Gedvilas (1901–1981), Lithuanian Soviet politician, first Prime Minister of the Lithuanian SSR
• Mečislovas Leonardas Paliulionis (1834–1908), Roman Catholic bishop
• Mečislovas Reinys (1884–1953), Lithuanian Roman Catholic archbishop and professor

• Mieczysław Bareja, a Polish judge and politician
• Mieczysław Batsch, Polish footballer
• Mieczysław Boruta-Spiechowicz, a Polish military officer, a general of the Polish Army and a notable member of the post-war anti-communist opposition in Poland
• Mieczysława Ćwiklińska, a Polish film actress, stage actor and singer. She was often nicknamed Lińska or Amiette.
• Mieczysław Fogg, Polish singer
• Mieczysław Garsztka, Polish aviator, flying ace in the German Air Force in World War I
• Mieczysław Halka Ledóchowski, a Cardinal Ledóchowski
• Mieczysław Horszowski, Polish pianist
• Mieczysław Jagielski, Polish communist politician and economist
• Mieczysław Janowski, Polish politician and Member of the European Parliament
• Mieczysław Kalenik, Polish actor
• Mieczysław Karłowicz, Polish composer and conductor
• Mieczysław Kawalec, Polish officer in the anti-communist resistance
• Mieczysław Mickiewicz, Polish-Ukrainian politician
• Mieczysław Moczar, Polish communist who played a prominent role in the history of the Polish People's Republic
• Mieczysław Mokrzycki, Polish Catholic archbishop
• Mieczysław Morański, Polish actor, famous for cartoon voice-overs
• Mieczysław Munz, Polish-American pianist
• Miguel Najdorf, Polish-born Argentine chess grandmaster of Jewish origin, famous for his Najdorf Variation
• Mieczysław Niedziałkowski, Polish writer and activist executed during the German AB-Aktion in Poland
• Mieczysław Nowicki, Polish Olympic medalist in bicycle racing and Minister of Sport
• Mieczysław Połukard, Polish speedway rider and coach
• Mieczysław "Mietek" Pemper, a Polish-born Jewish Holocaust survivor who assisted Oskar Schindler in his rescue activities during World War II
• Mieczysław Rakowski, Polish communist politician, historian and journalist
• Mieczysław Zygfryd Słowikowski, Polish army officer
• Mieczysław Smorawiński, Polish general who died in the Katyn massacre
• Mieczyslaw Solomonowicz, changed his name to Michael Sela (1924–2022), Israeli immunologist; President of the Weizmann Institute of Science
• Mieczysław Stoor, Polish film actor
• Mieczysław Demetriusz Sudowski, writer on esoteric, spiritual and mystical topics
• Mieczysław Weinberg, important Soviet composer of Polish-Jewish origin
• Mieczysław Wolfke, Polish physicist
• Mieczysław Zub, Polish serial killer

• Mieczysław "Mickey Doyle" Kuzik, from the television series Boardwalk Empire
• Mieczysław "Stiles" Stilinski, a character from the 2011 television series Teen Wolf.

• Mieszko, possible diminutive form
• Mstislav (given name)
• Polish name
• Slavic names

• http://www.behindthename.com/name/mieczysl16aw