Merkuriusz Polski Ordynaryjny (The Polish Mercury Ordinary; original 17th-century Polish spelling: Merkuryusz Polski Ordynaryiny; full title: Merkuriusz Polski dzieje wszystkiego świata w sobie zamykający, dla informacji pospolitej: The Polish Mercury, Encompassing All the World's Affairs, for the Common Knowledge) was the first Polish newspaper (actually, a weekly), published from 1661, first in Kraków, then in Warsaw.

[2] Though short-lived, it gave its name to several later newspapers, notably the Merkuriusz Polski published in London, 1955–58.

Sponsored by the court of King John II Casimir of Poland and his consort Queen Marie Louise Gonzaga, the newspaper was a weekly devoted chiefly to contemporary politics, European dynastic affairs, and monarchs' military campaigns.

With regard to internal affairs, it promoted political reforms and the strengthening of monarchical power.

[3] Merkuryusz was edited by Hieronim Pinocci, an Italian merchant who had migrated to Poland and served in notable posts in the royal administration, including those of master of the Kraków mint and secretary to King John II Casimir.