柴燃联合动力方式，复合柴油燃气涡轮系统简称柴-燃联合（英语：Combined diesel and gas或CODAG），是用于舰艇一种动力组合方式。其特点是高速运行时柴油机组和燃气轮机组同时运行，低速时可以仅以柴油机组运行。较低速巡航时采用柴油机驱动，较高工况时采用燃气轮机驱动，在最高工况时可将柴油机和燃气轮机的功率同时并入。以其优越的性能在世界上广泛应用于大中型水面舰艇。

需要注意的是与另一种动力组合方式柴燃交替动力方式（CODOG，低速时使用柴油机组，高速时使用燃气轮机组，交替运行）是不同的两种动力组合方式。

Combined diesel and gas (CODAG) is a type of propulsion system for ships which need a maximum speed that is considerably faster than their cruise speed, particularly warships like modern frigates or corvettes.

It consists of diesel engines for cruising and gas turbines that can be switched on for high-speed transits. In most cases the difference of power output from diesel engines alone to diesel and turbine power combined is too large for controllable-pitch propellers to limit the rotations so that the diesels can continue to operate without changing the gear ratios of their transmissions. Because of that, special multi-speed gearboxes are needed. This contrasts to CODOG systems, which couple the diesels with a simple, fixed ratio gearbox to the shaft, but disengages when the turbine is switched on.