Kernel can mean:

• A seed, in plants
• The atomic nucleus
• Kernel (computer science), the central component of most operating systems
  • Linux kernel
• The kernel trick in machine learning
• In game theory, a cooperative solution concept
• Kernel (programming language), a Scheme-like language
• Kernel (Lilo & Stitch), experiment 014 from the Lilo & Stitch cartoon series
• Kernel Fleck, a character in the Demonata series of books
• In mathematics:
  • Kernel (mathematics)
  • Positive definite kernel
  • Kernel (algebra)
  • Kernel (linear operator)
  • Kernel (matrix)
  • Kernel of a function
  • Kernel of an integral transform
  • Kernel (statistics)
  • Stochastic kernel
  • Convolution kernel, as of a linear filter
  • Kernel (category theory)
  • Heat kernel
  • Polygon kernel