'Los' may refer to:

★ Jerzy Łoś, a Polish mathematician and logician

★ LOS, Land of Smile (Thailand)

★ Los, a song from the Rammstein album ''Reise, Reise''

★ PZL.37 Łoś, a Polish twin-engine medium bomber, used in the Invasion of Poland in 1939

★ Crimson King, known as Los, the main villain of Stephen King's ''Dark Tower'' series

★ Los (in Greek, ''Λως''), a prominent family of shipping magnates from the Aegean island of Chios

★
★ Constantine M. Los

★ Los (village), a village in Ljusdal Municipality, Hälsingland , Gävleborgs län, Sweden

★ LOS (power company), a Norwegian power company

★ Los, a character from William Blake's poetry
'LOS' may refer to:

★ Level of service, a measure by which transportation planners reckon the quality of service on transportation devices

★ Line-of-sight, a classification of radio waves where any obstruction between the transmitting and receiving antenna will block the signal

★ Loss of signal

★ Law of the Sea, several United Nations events and one treaty that provided new universal legal controls for the management of marine natural resources and the control of pollution

★ Line of supply, the transportation infrastructure that supports a military unit

★ Murtala Mohammed International Airport (IATA airport code:LOS), an airport in Lagos, Nigeria

★ Large offspring syndrome, a phenomenon found occasionally in calves and lambs which are born to parents which have been cloned or otherwise subject to embryo manipulation

★ Line-of-sight propagation

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