The first ceremonial first pitch ever thrown was tossed by former Japanese Prime Minister Ōkuma Shigenobu at a baseball game in Koshien, Japan, back in 1908. Two years later, US President William Howard Taft started the tradition in the United States, tossing a pitch (shown above) in Washington DC on the opening day of the Washington Senators’ season. Since then, every US president has thrown at least one ceremonial first pitch, and they have all been documented in photographs.
Here’s a look at some historical photos of US presidents throwing their ceremonial pitches.
You can also find a complete list of presidential first pitches over on Wikipedia. The Week has put together an even more comprehensive gallery of presidential first pitch photos from Taft to Obama.