Guinness Pakru is the stage name of Ajay Kumar, an Indian actor, director, writer, and musician who holds the Guinness World Record for being the shortest actor to appear in a full-length film. He is 2 ft 6 in (76 cm) tall and is known for his comedic roles in Malayalam cinema.

Pakru was born on August 31, 1976 in Kottayam, Kerala. He made his film debut as a child artist in the 1986 movie Ambili Ammavan (The Moon), where he played the best friend of the main character. He became famous for his role as the dwarf Prince in the 2005 film Athbhutha Dweepu, for which he won a Kerala State Film Award for Special Jury Mention. He has appeared in more than 60 movies, including My Big Father and Fancy Dress. 

Pakru has been married to Gayatri Mohan since 2006 and they have a daughter named Deepthakirthi.