Lobe may refer to:
- Lobe (anatomy)
- Lobation, a characteristic of the nucleus of certain biological cells
- Glacial lobe, a lobe-shaped glacier
- Sidelobe, an identifiable segment of an antenna radiation pattern
- Grating lobe, a sidelobe that is much higher than all other side lobes, approximately the same as the main beam — exists only in phased arrays
- Main lobe
- Acoustic lobe, radiation pattern exhibited by multi-driver loudspeakers
- Lobe, a large-scale structure of a radio galaxy
- Roche lobe, the region of space around a star in a binary system within which orbiting material is gravitationally bound to that star
- Lobe, an oblong protrusion from a camshaft
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