Bessel
Bessel may refer to:
 Bessel beam
 Bessel ellipsoid
 Bessel function in mathematics
 Bessel's inequality in mathematics
 Bessel's correction in statistics. Bessel filter, a linear filter often used in audio crossover systems
 Bessel Fjord, NE Greenland
 Bessel Fjord, NW Greenland
 Bessel (crater), a small lunar crater
 Bessel transform, also known as Fourier-Bessel transform or Hankel transform
 Bessel window, in signal processing 
 Besselian date, see Epoch (astronomy)#Besselian years
 , a German merchant ship in service 1928–45, latterly for the Kriegsmarine

People
 Friedrich Wilhelm Bessel (1784–1846), German mathematician, astronomer, and systematizer of the Bessel functions

See also
 Bessell