Samuel Heinrich Schwabe (October 25, 1789 – April 11, 1875) was a German astronomer.
Schwabe was born at Dessau. At first an apothecary, he turned his attention to astronomy, and in 1826 commenced his observations on sunspots. In 1843 he made the suggestion of a probable ten year period (i.e. that at every tenth year the number of spots reached a maximum), but it met with scant approval, and he continued his observations, which were afterwards utilized in 1851 by Alexander von Humboldt in the third volume of his Kosmos. The periodicity of sunspots is now fully recognized; and to Schwabe is thus due the credit of one of the most important discoveries in astronomy.
In 1857 Schwabe was awarded the Gold Medal of the Royal Astronomical Society.