- Quantum espresso
- Quantum field theory
- Quantum gate
- Quantum graph
- Quantum gravity
- Quantum harmonic oscillators
- Quantum imaging
- Quantum information
- Quantum information science
- Quantum logic
- Quantum logic gates
- Quantum machine learning
- Quantum materials
- Quantum mechanics
- Quantum memory
- Quantum networks
- Quantum neural networks
- Quantum noise
- Quantum numbers
- Quantum optics
- Quantum oscillations
- Quantum phase transitions
- Quantum radar
- Quantum sensing
- Quantum sensors
- Quantum simulation
- Quantum simulator
- Quantum spin hall effect
- Quantum spin liquid
- Quantum state
- Quantum statistical mechanics
- Quantum statistics
- Quantum superposition
- Quantum supremacy
- Quantum technology
- Quantum teleportation
- Quantum tunneling
- Quantum tunnelling
- Quantum turing machine
- Quantum vortex
- Quantum walk
- Quantum well lasers
- Quantum wells
- Quantum wires
- Quantum yield
- Quantum zeno effect
- Quantum-cascade lasers
- Quantum-confined stark effect
- Quarantine
- Quarry
- Quarry lake
- Quarry tile
- Quarter
- Quarter-wave impedance transformer
- Quartic
- Quartic equation
- Quartiles
- Quartz
- Quartz arenite
- Quartz crystal microbalance with dissipation monitoring
- Quartz diorite
- Quartz fiber
- Quartz gabbro
- Quartz inversion
- Quartz monzonite
- Quartz-dolerite
- Quartz-porphyry
- Quartzite
- Quasi-Fermi level
- Quasi-arithmetic mean
- Quasi-experimental
- Quasi-identifier
- Quasi-likelihood
- Quasi-polynomial
- Quasi-solid
- Quasiconvexity
- Quasicrystals
- Quasinorm
- Quasiparticles
- Quasiperiodic
- Quasiperiodic function
- Quasiperiodic motion
- Quasiperiodicity
- Quasistatic approximation
- Quasistatic loading
- Quaternary
- Quaternary ammonium cation
- Quaternary ammonium salts
- Quaternary phase
- Quaternary structure
- Quaternion group
- Quaternions
- Quaternium-15
- Qubit
- Queen post
- Quenching
- Quercetin
- Query
- Query expansion
- Query language
- Query optimization
- Query plan
- Query rewriting
- Query string
- Question answering
- Questionnaire
- Queue number
- Queueing theory
- Queues
- Queuing delay
- Quick clay
- Quick reference handbook
- QuickTime
- Quickhull
- Quicksand
- Quicksilver
- Quicksort
- Quiescent current
- Quiet areas
- Quinaldine
- Quinazoline
- Quinazolinone
- Quinic acid
- Quinine
- Quinoid
- Quinoline
- Quinone
- Quinoxaline
- Quintic equation
- Quoins
- Quorum sensing
- Quota sampling
- Quotient
- Quotient groups
- Quotient ring
- Quotient rule
- Qutrit
- R*-tree
- R+ tree
- R-134a
- R-407C
- R-410A
- R-phase
- R-value
- R245fa
- R2a agar
- R407C
- RAD
- RAFT
- RAID