Kiefer Isaac Crisologo Ravena (; born October 27, 1993) is a Filipino basketball player for the NLEX Road Warriors of the Philippine Basketball Association (PBA).
Ravena played for the Ateneo Blue Eagles in the UAAP during his college days.
He is playing both guard positions.
The son of former PBA player Ferdinand "Bong" Ravena, Ravena enjoyed a successful high school basketball career at the Ateneo de Manila High School in Loyola Heights, Quezon City where he was recognized as one of the top high school basketball players in the Philippines.
Ravena is a three-time UAAP Juniors Champion (2008, 2009 and 2010), two-time UAAP Juniors Finals MVP (2009 and 2010), two-time UAAP Juniors Mythical Team member (2009 and 2010), one-time FIBA Asia U-18 Mythical Team member (2010), two-time UAAP Seniors Champion (2011 and 2012) and three-time UAAP Seniors Mythical Team member (2011, 2014 and 2015).
He is also the UAAP Season 74 Rookie of the Year and the UAAP Season 77 and 78 Most Valuable Player recipient.
At the 2011, 2013, 2015 and 2017 Southeast Asian Games, he won gold medals as a member of the Gilas Cadets (formerly Sinag Pilipinas).