- Robotic arm
- Robotic materials
- Robotic sensors
- Robotic surgery
- Robotino
- Robots
- Robust control
- Robust decision making
- Robust decision-making
- Robust optimization
- Robust principal component analysis
- Robust regression
- Robust statistics
- Robustness
- Rocchio algorithm
- Rochelle salt
- Rock
- Rock bolts
- Rock bursts
- Rock dust
- Rock flour
- Rock formation
- Rock fragment
- Rock mass classification
- Rock shed
- Rocker arm
- Rocker-bogie
- Rocket engine
- Rocket engine nozzle
- Rocket fuel
- Rocket propellant
- Rocket sled
- Rockets
- Rockfall
- Rocks
- Rockslides
- Rockwell scale
- Rod cells
- Rod-shaped
- Rods
- Rogfast
- Rogowski coil
- Rogue waves
- Rohini
- Roll bending
- Roll bonding
- Roll center
- Roll forming
- Roll trailer
- Roll-off
- Roll-to-roll
- Rollback
- Rolle's Theorem
- Roller bearings
- Roller burnishing
- Roller chain
- Roller electrospinning
- Roller mill
- Roller screw
- Rolling
- Rolling chassis
- Rolling mill
- Rolling resistance
- Rolling-element bearing
- Rollovers
- Roman aqueducts
- Roman cement
- Roman concrete
- Romanechite
- Romidepsin
- Roof
- Roof coating
- Roof gardens
- Roof pitch
- Roof shingles
- Roof tiles
- Roofing
- Roofing felt
- Roofing slate
- Rooftop solar
- Room acoustics
- Room air distribution
- Room and pillar
- Room and pillar mining
- Room for the River
- Room temperature
- Root
- Root canal
- Root cause analysis
- Root directory
- Root exudates
- Root hairs
- Root locus
- Root locus analysis
- Root microbiome
- Root nodules
- Root resorption
- Root sheath
- Root system
- Root test
- Root-finding algorithms
- Root-knot nematodes
- Root-raised-cosine filter
- Rootkits
- Roots
- Roots blowers
- Roots of unity
- Rope
- Rosacea
- Rose oxide
- Rosemary
- Rosetta
- Rosette sampler
- Rosiglitazone
- Rosin
- Ross procedure
- Rossby waves
- Rossmann fold
- Roster
- Rosuvastatin
- Rotameters
- Rotary actuator
- Rotary dryer
- Rotary encoder
- Rotary engines
- Rotary feeder
- Rotary hammer
- Rotary kilns
- Rotary stage
- Rotary steerable systems
- Rotary switch
- Rotary table
- Rotary tool
- Rotary transformer
- Rotary valves
- Rotary vane pump
- Rotating biological contactor
- Rotating detonation engine
- Rotating magnetic field
- Rotating reference frame
- Rotating wave approximation
- Rotating-wave approximation
- Rotation
- Rotation number
- Rotation of axes
- Rotation period
- Rotational brownian motion
- Rotational correlation time
- Rotational diffusion
- Rotational energy