[ Mathematics

• Cauchy–Riemann equations
• Chapman–Kolmogorov equation
• Clairaut's equation
• Fredholm integral equation
• Hill differential equation
• Ishimori equation
• Laplace's equation
• Maurer-Cartan equation
• Pell's equation
• Poisson's equation
• Riccati equation
• Sine-Gordon equation
• Verhulst equation

[ Physics

• Ampère's circuital law
• Bernoulli's equation
• Bogoliubov–Born–Green–Kirkwood–Yvon hierarchy of equations
• Boltzmann equation
• Borda–Carnot equation
• Darcy–Weisbach equation
• Dirac equation
  • Dirac equation in the algebra of physical space
• Doppler equations
• Drake equation (aka Green Bank equation)
• Einstein's field equation
• Einstein-Maxwell-Dirac equations
• Euler equations (fluid dynamics)
• Euler's equations (rigid body dynamics)
• Relativistic Euler equations
• Euler–Lagrange equation
• Faraday's law of induction
• Fokker–Planck equation
• Fresnel equations
• Friedmann equations
• Gauss's law for electricity
• Gauss's law for gravity
• Gauss's law for magnetism
• Gibbs–Helmholtz equation
• Gross–Pitaevskii equation
• Hamilton–Jacobi–Bellman equation
• Helmholtz equation
• Karplus equation

• Kepler's equation
• Kepler's laws of planetary motion
• Kirchhoff's diffraction formula
• Klein–Gordon equation
• Korteweg–de Vries equation
• Landau–Lifshitz equation
• Lane–Emden equation
• Langevin equation
• Levy–Mises equations
• Lindblad equation
• Lorentz equation
• Maxwell's equations
• Maxwell's relations
• Newton's laws of motion
• Navier–Stokes equations
• Reynolds-averaged Navier–Stokes equations
• Prandtl–Reuss equations
• Prony equation
• Rankine–Hugoniot equation
• Roothaan equations
• Sackur–Tetrode equation
• Schrödinger equation
• Screened Poisson equation
• Schwinger–Dyson equation
• Sellmeier equation
• Stokes–Einstein relation
• Tsiolkovsky rocket equation
• Van der Waals equation
• Vlasov equation
• Wiener equation

[ Chemistry

• Arrhenius equation
• Henderson–Hasselbalch equation
• Michaelis–Menten equation
• Nernst equation

[ Biology

• Lotka–Volterra equation

[ Economics

• Black–Scholes equation
• Fisher equation

[ Maths

• Algebraic equation
• Polynomial equations
  • Linear equation
  • Quadratic equation
  • Cubic equation
  • Biquadratic equation
  • Quartic equation
  • Quintic equation
  • Sextic equation
• Characteristic equation
• Class equation
• Comparametric equation
• Difference equation
• Differential equation
  • Ordinary differential equation
  • Partial differential equation
  • Total differential equation
• Diophantine equation
• Equation
• Modular equation
• Parametric equation
• Replicator equation

[ Physics

• Advection equation
• Barotropic vorticity equation
• Continuity equation
• Diffusion equation
• Drag equation
• Equation of motion
• Equation of state
• Equation of time
• Heat equation
• Ideal gas equation
• Ionic equation
• Mass-energy equivalence equation
• Primitive equations
• Relativistic wave equations
• Vorticity equation
• Wave equation

[ Chemistry

• Chemical equation (aka molecular equation)
• Thermochemical equation

[ Telecommunications engineering

• Password length equation
• Telegrapher's equations