• Bessel beam
• Bessel ellipsoid
• Bessel function in mathematics
• Bessel's inequality in mathematics
• Bessel filter, a linear filter often used in audio crossover systems
• Bessel (crater), a small lunar crater
• Bessel transform, also known as Fourier-Bessel transform or Hankel transform
• Bessel window
• Besselian date

Bessel is the name of:

• Friedrich Bessel (1784–1846), German mathematician, astronomer, and systematizer of the Bessel functions
• Bessel Kok (born 1941), Dutch businessman and chess organiser

See also

• Bessell