Hum
Hum or HUM may refer to:

Science
Hum (sound), a sound produced with closed lips, or by insects, or other periodic motion
Mains hum, an electric or electromagnetic phenomenon
The Hum, an acoustic phenomenon
Venous hum, a physiological sensation

Places
Historical
Hum (zemlja), a medieval principality, now part of Bosnia and Herzegovina and Croatia

Bosnia and Herzegovina
Mount Hum (Sarajevo), a hill north of Sarajevo
Mount Hum (Mostar), a hill south of Mostar
Hum, Bugojno, a village in the Federation of Bosnia and Herzegovina
Hum, Foča, a village in Republika Srpska
Hum, Trebinje, a village in Republika Srpska

Croatia
Hum, Croatia, a town in Istria
Mount Hum (Vis), a hill on the island of Vis in Dalmatia
Mount Hum (Plaški), a hill in the region of mountainous Croatia
Mount Hum (Lastovo), a hill on the island of Lastovo in Dalmatia

Serbia
Hum (Niš), a village
Hum (Pešter), a mountain on the border of Serbia and Montenegro

Slovenia
Mount Hum (Laško), a hill in Styria
Hum, Brda, a village in the Littoral region

United Kingdom
Humberside, former county in England, Chapman code HUM

Elsewhere
Houma–Terrebonne Airport, IATA code HUM, in Louisiana, United States
Hum Island near Antarctica

People
Hum Jayega (1922–1992), Nepali Indian comedian
Christopher Hum (born 1946), British diplomat
Phan Văn Hùm (1902–1946), Vietnamese Trotskyist

Arts, entertainment, and media
Music
Hum (band), a band from Champaign, Illinois, US
The Hum (Hookworms album), 2014
The Hum (O'Hooley & Tidow album), 2014
Hum (Eerie Wanda album), 2016
"Hum", 2014 song by Tigers Jaw from Charmer
The Hum, Unwritten Law album

Other uses in arts, entertainment, and media
Hum (film), a 1991 Bollywood film
Highly unusual method, or HUM, in contract bridge
Hum FM, an Emirati radio station
Hum TV, a Pakistani television channel

Other uses
Honda of the UK Manufacturing, British motor vehicle assembler
Verizon Hum, a vehicle diagnostic and tracking system