Response time may refer to:
The time lagged between the input and the output signal which depends upon the value of passive components used.
Response time (technology), the time a generic system or functional unit takes to react to a given input
Responsiveness, how quickly an interactive system responds to user input
Round-trip delay time, in telecommunications
Emergency response time, the amount of time that emergency responders take to arrive at the scene of an incident from the time that the emergency response system was activated
Reaction time, the elapsed time between the presentation of a sensory stimulus and the subsequent behavioral response, in Mental chronometry
Search response time or query response time, the time it takes a web server to respond when it receives a query