营运成本(营业成本, operating expense, OPEX) 指的是运行企业的持续性、消耗性的支出，与之对照的是资本支出(captial expenditure, CAPEX)。例如：购买影印机的支出属于资本支出(CAPEX)，而纸张、墨水、电力、维修的费用则属于营运成本(OPEX)。在企业中，营运成本可能包含了员工薪资、设备租金、场地租金。
营运成本包含了：
- 维修、保养，如清除垃圾、影印机维修。
- 广告
- 办公室支出
- 律师费用
- 不动产租金、税金
- 员工薪资
An operating expense, operating expenditure, operational expense, operational expenditure or Opex is an ongoing cost for running a product, business, or system.[1] Its counterpart, a capital expenditure (Capex), is the cost of developing or providing non-consumable parts for the product or system. For example, the purchase of a photocopier involves Capex, and the annual paper, toner, power and maintenance costs represents Opex.[2] For larger systems like businesses, Opex may also include the cost of workers and facility expenses such as rent and utilities.