Paraboolpeegel on peegel, mis tänu oma kujule koondab valgust, mille tõttu kasutatakse paraboolpeeglit peamiselt teleskoopides; paraboolpeegli kuju on osa ümmargusest paraboloidist, st pinnast, mille tekitab selle telje ümber pöörlev parabool, mis muudab piki telge liikuva sissetuleva tasapinnalise laine sfääriliseks laineks, mis läheneb fookuse poole; seevastu paraboolpeegli fookusesse paigutatud punktallika tekitatud sfääriline laine peegeldub tasapinnaliseks laineks, mis levib kollimeeritud kiirena piki telge.
Tbe shape of a parabolic reflector is part of a circular paraboloid, that is, the surface generated by a parabola revolving around its axis; the parabolic reflector transforms an incoming plane wave travelling along the axis into a spherical wave converging toward the focus; conversely, a spherical wave generated by a point source placed in the focus is reflected into a plane wave propagating as a collimated beam along the axis.
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