Prince Krzysztof Radziwiłł, epithet "Piorun" ("Lightning") (, 11 July 1547 – 20 March 1603) was a Reichsfürst of the Holy Roman Empire and a member of the nobility of the Polish–Lithuanian Commonwealth.
He was cup-bearer of Lithuania from 1569; Field Lithuanian Hetman from 1572; Castellan of Trakai, Deputy Chancellor of Lithuania from 1579; Voivode of Vilnius from 1584; Grand Lithuanian Hetman from 1589; and Starost. He received the epithet "Piorun" (translated as "Lightning" or "Thunderbolt") for his deadly and very successful cavalry raids against Ivan the Terrible's forces in Russian Tsardom territory during the Livonian War, forcing it to capitulate.
His achievements, combined with his powerful Radziwiłł family backing, helped him rise to his various voivode and starost offices and further increased his family's wealth.