FCX may refer to:
- FCX file compression, an older file compression utility and format used on VAX and personal computers.
- Honda FCX, a family of hydrogen fuel cell automobiles from Honda
- Honda FCX Clarity, a new-generation hydrogen fuel cell car from Honda
- Freeport-McMoRan, a mining company whose NYSE ticker symbol is FCX
- Bell FCX-001, a concept helicopter by Bell Helicopter
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