Hardcore, hard core or hard-core may refer to:

• Hardcore punk, a subgenre of punk rock music
  • some of its subgenres and derivatives such as metallic hardcore and melodic hardcore
  • harDCore, a portmanteau abbreviation for hardcore punk music in Washington, D.C.
  • hardcore dancing, a maneuver related to moshing, usually performed at hardcore punk and heavy metal shows
• Hardcore techno, a style of electronic dance music
  • some of its subgenres and derivatives such as breakbeat hardcore, happy hardcore, UK hardcore, industrial hardcore, early hardcore and mainstream hardcore
• Hardcore hip hop, a subgenre of hip hop music
• Digital hardcore, a fusion between hardcore punk and hardcore techno or other electronic music styles

Washington, D.C. has had one of the first and most influential hardcore punk scenes in the United States since the early 1980s.