Babis "Bob" Katsionis (Greek: Μπάμπης Κατσιώνης; born February 17, 1977, in Athens, Greece) is a Greek guitarist and keyboardist and the lead guitarist and keyboard player for the heavy metal/power metal bands Stray Gods, Warrior Path, Outloud, and Serious Black; he was part of Firewind, before leaving in 2020 for personal reasons. He is the only musician to ever win the same category "Best Keyboardist" in Greek Metal Hammer's Annual Readers' Polls for 5 years in a row (2006–2011). He is founder of Progressive Vision Group, a videoclip making company, which has produced more than 230 videos for rock and metal artists since 2002.
