Walenty Stefanski (1813, Sródka, Poznan County - 1877) was a Polish bookseller, publisher, political activist and co-founder of the Polish League (Liga Polska).
He supported autonomy for Greater Poland during the Greater Poland Uprising of 1848 against Kingdom of Prussia, and was a member of the Polish National Committee (1848).
Son of a fisherman, Stefanski came from a lower-class family and was mostly self-educated.
He taught himself French and Latin and learned German while working as an apprentice to a German owned printer.
As a teenager he took part in the November Uprising in Congress Poland against Russian rule.