覆晶技术（英语：Flip-Chip），也称“倒晶封装”或“倒晶封装法”，是芯片封装技术的一种。此一封装技术主要在于有别于过去芯片封装的方式，以往是将芯片置放于基板（chip pad）上，再用打线技术（wire bonding）将芯片与基板上之链接点连接。覆晶封装技术是将芯片连接点长凸块（bump），然后将芯片翻转过来使凸块与基板（substrate）直接链接而得其名。

Flip Chip技术起源于1960年代，是IBM开发出之技术，IBM最早在大型主机上研发出覆晶技术。由于覆晶比其它球栅数组封装（BGA; Ball grid array）技术在与基板或衬底的互连形式要方便的多，目前覆晶技术已经被普遍应用在微处理器封装，而且也成为绘图、特种应用、和电脑芯片组等的主流封装技术。借助市场对覆晶技术的推力，封装业者必需提供8吋与12吋晶圆探针测试、凸块增长、组装、至最终测试的完整服务。

Flip chip, also known as controlled collapse chip connection or its acronym, C4, is a method for interconnecting semiconductor devices, such as IC chips and microelectromechanical systems (MEMS), to external circuitry with solder bumps that have been deposited onto the chip pads. The solder bumps are deposited on the chip pads on the top side of the wafer during the final wafer processing step. In order to mount the chip to external circuitry (e.g., a circuit board or another chip or wafer), it is flipped over so that its top side faces down, and aligned so that its pads align with matching pads on the external circuit, and then the solder is reflowed to complete the interconnect. This is in contrast to wire bonding, in which the chip is mounted upright and wires are used to interconnect the chip pads to external circuitry.