What is the fastest pitch ever thrown?

The fastest officially recorded pitch in Major League Baseball history was thrown by Aroldis Chapman. On September 24, 2010, while pitching for the Cincinnati Reds, he threw a fastball that was clocked at 105.1 miles per hour (169.1 kilometers per hour). This speed has been verified by MLB's official tracking systems.

It's important to note that:

• Technological advancements: Pitch speed measurement technology has improved over time, so older claims of even faster pitches are often less reliable.
• Margin of error: Even with advanced technology, there's a small margin of error in speed readings.
• Context matters: While Chapman's pitch is the officially recorded fastest, other pitchers may have thrown pitches at similar speeds that weren't officially tracked or recorded with the same precision.

Therefore, while 105.1 mph is the officially recognized record, it's possible that even faster pitches have been thrown, but not accurately measured and verified.