- Runan Xian
- runaway bannermen and slaves, law of
- runaway coalescence
- runaway electron
- runaway growth
- runaway of bit
- runaway reaction
- runaway rotating speed of pump
- runaway selection hypothesis
- runaway sexual selection
- runaway star
- runback test
- runchang pill
- Runcorn New Town
- Rundi
- run down
- rundown
- Runeberg Prize
- rune pattern of gluttony
- run error
- Runestone
- Runge
- Runge domain
- Runge Kutta Fehlberg method
- Runge-Kutta-Fehlberg method