Nihil novi nisi commune consensu ("Nothing new without the common consent") is the original Latin title of a 1505 act or constitution adopted by the Polish Sejm (parliament), meeting in the royal castle at Radom.
Nihil novi effectively established "nobles' democracy" in what came to be known as the Polish "Commonwealth [or Republic] of the Nobility." It was a major component of the evolution and eventual dominant position of the Polish parliament (Sejm).
"Nihil novi," in this political sense, is interpreted in the vernacular as "Nothing about us without us" (in Polish, "Nic o nas bez nas").
The Latin expression, "nihil novi" ("nothing new"), had previously appeared in the Vulgate Bible phrase, "nihil novi sub sole" ("there is nothing new under the sun"), in Ecclesiastes 1:9.
The Sejm's 1505 Act of Nihil novi nisi commune consensu marked an important victory for Poland's nobility over her kings. It forbade the king to issue laws without the consent of the nobility, represented by the Senat and Chamber of Deputies, except for laws governing royal cities, crown lands (królewszczyzny), mines, fiefdoms, royal peasants, and Jews.