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In mathematics, the term **quadratic** describes something that pertains to squares, to the operation of squaring, to terms of the second degree, or equations or formulas that involve such terms. *Quadratus* is Latin for *square*.

- Quadratic function (or quadratic polynomial), a polynomial function that contains terms of at most second degree
- Complex quadratic polynomials, are particularly interesting for their sometimes chaotic properties under iteration

- Quadratic equation, a polynomial equation of degree 2 (reducible to 0 =
*ax*^{2}+*bx*+*c*) - Quadratic formula, calculation to solve a quadratic equation for the independent variable (
*x*) - Quadratic field, an algebraic number field of degree two over the field of rational numbers
- Quadratic irrational or "quadratic surd", an irrational number that is a root of a quadratic polynomial

- Quadratic integral, the integral of the reciprocal of a second-degree polynomial

- Quadratic form (statistics), scalar quantity ε'Λε for a n-dimensional square matrix
- Quadratic mean, the square root of the mean of the squares of the data
- Quadratic variation, in stochastics, useful for the analysis of Brownian motion and martingales

- Quadratic reciprocity, a theorem from number theory
- Quadratic residue, an integer that is a square modulo
*n* - Quadratic sieve, a modern integer factorization algorithm

- Quadratic convergence, in which the distance to a convergent sequence's limit is squared at each step
- Quadratic differential, a form on a Riemann surface that locally looks like the square of an abelian differential
- Quadratic form, a homogeneous polynomial of degree two in a number of variables
- Quadratic programming, a special type of mathematical optimization problem
- Quadratic growth, an asymptotic growth rate proportional to a quadratic function
- Periodic points of complex quadratic mappings, a type of graph that can be used to explore stability in control systems
- Quadratic bézier curve, a type of bezier curve

- Quadratic probing, a scheme in computer programming for resolving collisions in hash tables
- Quadratic classifier, used in machine learning to separate measurements of two or more classes of objects
- Quadratic time, in referring to algorithms with quadratic time complexity

*Quadratic*(collection), a 1953 collection of science fiction novels by Olaf Stapledon and Murray Leinster

- All pages with titles beginning with
*Quadratic* - All pages with titles containing
*Quadratic* - Cubic (disambiguation), relating to a cube or degree 3, as next higher above
*quadratic* - Linear, relating to a line or degree 1, as next lower below
*quadratic* - Quad (disambiguation)
- Quadratic transformation (disambiguation)

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