  We discuss quadratic transformations for orthogonal polynomials in one and
two variables. In the one-variable case we list many (or all) quadratic
transformations between families in the Askey scheme or $q$-Askey scheme. In
the two-variable case we focus, after some generalities, on the polynomials
associated with root system $BC_2$, i.e., $BC_2$-type Jacobi polynomials if
$q=1$ and Koornwinder polynomials in two variables in the $q$-case.
