A horn is a popular instrument in A Song of Ice and Fire for quick and easy communication.
A horn is often made from the horn of a horned animal, such as an aurochs or even a dragon.. Horns can come in various sizes. They can be banded with metals, such as bronze or gold. A dragon horn can have Valyrian glyphs written upon it. A warhorn's sound can be long and low and can carry far and wide.
Horns can be used to sound the alarum, to rouse camps, and to herald the coming of pit fighters. Sentries of the Night's Watch sound one blast when rangers return to the Wall, two blasts for wildlings, and three blasts for Others. p .
- Horn of Winter
- Horn of Herrock
- Dragon horns
- old warhorn
- House Celtigar horn
- Big Liddle's warhorn
- Rory's horn
- Tormund Horn-Blower's warhorn
- Alester Oakheart’s warhorn 
– Jon Snow's thoughts
A sentry's horn greeted them as they approached, sounding from on high like the cry of some, huge, deep-throated bird, a single long blast the meant rangers returning. 
– Jon Snow’s thoughts
– Asha Greyjoy's thoughts
– Jon Connington's thoughts
- A Clash of Kings, Chapter 34, Jon IV.
- A Feast for Crows, Chapter 19, The Drowned Man.
- A Dance with Dragons, Chapter 63, Victarion I.
- A Dance with Dragons, Chapter 26, The Wayward Bride.
- A Dance with Dragons, Chapter 61, The Griffin Reborn.
- A Dance with Dragons, Chapter 62, The Sacrifice.
- A Dance with Dragons, Chapter 59, The Discarded Knight.
- A Storm of Swords, Prologue.
- A Feast for Crows, Chapter 13, The Soiled Knight.
- A Dance with Dragons, Chapter 53, Jon XI.
- A Dance with Dragons, Chapter 35, Jon VII.