the fastest pitch on record in a baseball game was thrown by Aroldis Chapman, a Cuban-born relief pitcher in Major League Baseball. On September 24, 2010, while playing for the Cincinnati Reds, Chapman threw a pitch that was clocked at 105.1 miles per hour (169.1 kilometers per hour) during a game against the San Diego Padres. This speed was recorded by MLB's Statcast technology, which uses radar tracking systems to measure the velocity of pitches. It's worth noting that there have been other pitchers who have consistently thrown pitches in the triple digits, but Chapman's 105.1 mph pitch remains the fastest recorded in an official game. Please keep in mind that there may have been new developments or records set after i lost interest in that topic.