Ranar 1 ga watan Mayu ta duniya, wadda aka fi sani da "Ranar Ma'aikata ta Duniya" ko "Ranar Muzaharar Kasa da Kasa", ana bikin kowace shekara a ranar 1 ga Mayu kuma rana ce ta kasa da kasashe sama da 80 ke gudanarwa a duniya. Asalin wannan biki za a iya gano shi tun a ƙarshen karni na 19 a Amurka. A ranar 1 ga Mayu, 1886, dubban daruruwan ma'aikata a Chicago da sauran wurare a Amurka sun gudanar da wani gagarumin yajin aiki da zanga-zanga don fafutukar kwato musu hakkinsu na shari'a, inda suka bukaci a aiwatar da aikin sa'o'i takwas. A taron tunawa da wannan gagarumin yunkuri na ma'aikata, a watan Yulin 1889, kasa da kasa ta biyu karkashin jagorancin Engels ta zartar da wani kuduri a zauren taron Paris, a hukumance ta kafa ranar 1 ga Mayu a matsayin ranar ma'aikata ta duniya.
Bayan kafuwar jamhuriyar jama'ar kasar Sin, majalisar gudanarwar gwamnatin tsakiya ta kasar Sin ta yanke shawara a watan Disamba na shekarar 1949 ta ware ranar 1 ga watan Mayu a matsayin ranar ma'aikata bisa ka'ida. Ranar Mayu ba wai kawai abin tunawa ne na tarihi na haƙƙin haƙƙin haƙƙin ma'aikata da muradun ma'aikata ta hanyar gwagwarmayar gwagwarmaya ba, har ma da haɓaka ruhun "mafi ɗaukaka aiki". Yana tunatar da al'umma gaba daya don mutunta kokarin kowane ma'aikaci, kula da kimar da aiki ya haifar, tare da samar da yanayi mai kyau na zamantakewa wanda ke ba da shawara ga aiki da mutunta ma'aikata.
