Janusz Suchywilk of Grzymala Coat of Arms (c. 1310 – 5 April 1382) was a Polish nobleman (szlachcic), relative of Jarosław z Bogorii i Skotnik.

Janusz became Chancellor of the Polish Kingdom and Archbishop of Gniezno in 1374.

[1] He is considered as the co-author of King Casimir III of Poland's statutes.

An advocate of Kazko IV Prince of Słupsk for the Polish throne after the death of King Kazimierz.

He was the leader of the opposition to King Louis the Great.