弹性工时（英语：Flextime、Flexible working hours），是弹性利用正常工作时间的概念，为一种可变动性工作时间表，有别于需要员工朝九晚五的制式化传统工作时间。在弹性工时下，一天中有一个核心时段（大约是总工时／工作日中的百分之五十）要求员工一定要在其工作岗位上，在雇主或主管所期望的每日总工时不变之基础下，员工可以选择何时上下班，依其需求弹性调整(提早或延后)其工作时间，但须完成必要之工作。

Flextime (also spelled flexitime [British English], flexi-time) is a flexible hours schedule that allows workers to alter workday start and finish times. In contrast to traditional work arrangements that require employees to work a standard 9 a.m. to 5 p.m. day, flextime typically involves a "core" period of the day during which employees are required to be at work (e.g., between 11 a.m. and 3 p.m.), and a "bandwidth" period within which all required hours must worked (e.g., between 5:30 a.m. and 7:30 p.m.). The working day outside of the "core" period is "flexible time," in which employees can choose when they work, subject to achieving total daily, weekly or monthly hours within the "bandwidth" period set by employers, and subject to the necessary work being done . The total working time required of employees on flextime schedules is the same as that required under traditional work schedules. A flextime policy allows staff to determine when they will work, while a flexplace policy allows staff to determine where they will work. Advantages include allowing employees to coordinate their work hours with public transport schedules, with the schedules of their children, and with daily traffic patterns to avoid high congestion times such as rush hour. Some claim that flexible working will change the nature of the way we work.