Extreme may refer to:

• Extreme (band), an American band, most well-known for its ballad "More than Words"
• Extreme weather, severe or unseasonal weather
• Extreme value, the largest and the smallest element of a set
• Extremism, ideas or actions beyond what is deemed acceptable
• Extreme sport, featuring speed, height, danger or spectacular stunts
• Extremophile, an organism which thrives in or requires "extreme" conditions
• Extreme Programming, also known as XP
• Extreme (marketing), the term as used in advertising and marketing
• Dance Dance Revolution EXTREME
• Extreme Championship Wrestling

X-Treme may refer to:

• Adam X the X-Treme, a Marvel Comics character also known as Adam X or Adam Neramani
• Agostino Carollo, an Italian singer, disc jockey, and producer, better known as "X-Treme"

Ekstrem | Extreme | Extreme | Extreme