- Q-metric
- QMR (= quasi-minimal residual method)
- q-multinomial coefficient
- Q-number
- q-Pochhammer symbol
- q-polygamma function
- Q-polynomial
- Q-process
- q-product
- q-pseudoconcave space
- q-pseudoconvex space
- q-q plot (= quantile-quantile plot)
- Q-quantifier logic
- QR algorithm
- QR decomposition
- q-representation
- QR method
- QRS constant (= Quinn-Rand-Strogtz constant)
- q-series
- q-series identity
- q-shifted factorial
- Q-signature
- q-simplex
- q-sine
- Q-space