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On a bicycle, a internal gearbox is a gearbox that's located inside the bicycle frame, above the down-tube. This is very similar to how a motorcycle transmission is mounted.

Many framebuilders have experimented with this design over time, but haven't rolled out bikes to production, because they tend to fairly heavy.

Zerode G-1

The Zerode G-1 is a bicycle that incorporates a internal-gear-hub that's been modified to sit inside the frame.

More info: [1] [2]

Pinion P1.18

The Pinion P1.18 is actually located near the bottom bracket. However, it requires a substantially modified frame — the bottom bracket area of the frame is very different.

Pictures: [1] [2] [3] [4] [5]