List of Teachers' Days

Teacher's Day (Syria)

Public holidays in Turkmenistan

Revival, Unity, and Poetry of Magtymguly Day (Turkmenistan)

Mullivaikkal Remembrance Day

Mullivaikkal Remembrance Day (Sri Lankan Tamils)

Speech–language pathology

National Speech Pathologist Day (United States)

International Museum Day

International Museum Day

Independence Day (Somaliland)

Independence Day (Somaliland) (unrecognized)

Deportation of the Crimean Tatars

Day of Remembrance of Crimean Tatar genocide (Ukraine)

Public holidays in Russia

Baltic Fleet Day (Russia)

May 18 (Eastern Orthodox liturgics)

Christian feast day:
May 18 (Eastern Orthodox liturgics)

Venantius of Camerino

Christian feast day:
Venantius of Camerino

Pope John I

Christian feast day:
Pope John I

Felix of Cantalice

Christian feast day:
Felix of Cantalice

Saint Erik

Christian feast day:
Eric IX of Sweden

Beatification

Christian feast day:
Blessed Blandine Merten

Ælfgifu of Shaftesbury

Christian feast day:
Ælfgifu of Shaftesbury