Petr Lněnička (born July 20, 1979 in Litomyšl) is a Czech theater and film actor and member of the Kašpar theater company. He studied drama at DAMU. While still a student, he appeared as a guest performer at the Vinohrady Theater and the National Theater. After graduating, he joined the Kašpar theater company, where he still performs in most productions.

He is also involved in radio and dubbing work. He is the "voice" of Czech Radio's Radiožurnál station. He currently performs mainly at the Kašpar theater. He has appeared in episodic roles in the TV series Redakce, Poslední sezóna, Proč bychom se netopili, and in the films Swingtime, Tobruk, and Takový slušný člověk.