![Why every MLB player is wearing No. 42 today](https://images2.minutemediacdn.com/image/upload/c_fill,w_1440,ar_16:9,f_auto,q_auto,g_auto/shape/cover/sport/4aa7d86d9087c833447a4ca2f50606d255206b57157aaffc810f910a3b582730.jpg)
Why are MLB players wearing No. 42 jerseys today?
![Why every MLB player is wearing No. 42 today](https://qph.cf2.quoracdn.net/main-qimg-4db09e4f30c9154e54e206676a744fc8-lq)
Do MLB players have to wear numbers on their uniforms? - Quora
![Why every MLB player is wearing No. 42 today](https://sports.cbsimg.net/images/visual/whatshot/jackie-rivera-3813.jpg)
The No. 42 All-Star team
![Why every MLB player is wearing No. 42 today](https://static01.nyt.com/images/2010/04/15/sports/15rivera_CA0/15rivera_CA0-popup.jpg?quality=75&auto=webp&disable=upscale)
Yankees' Mariano Rivera Is the Last No. 42 - The New York Times
![Why every MLB player is wearing No. 42 today](https://content.sportslogos.net/news/2020/08/jackie-robinson-day-caps-august-28-2020-42-mlb-baseball-reds-phillies-pirates-blue-jays-reds-diamondbacks-dbacks.jpg)
Jackie Robinson Day 2020, All Players Wearing #42 and Patches Today – SportsLogos.Net News
![Why every MLB player is wearing No. 42 today](https://www.clarionledger.com/gcdn/-mm-/75f53bc65927274cf75697faa891be63c9c16f53/c=0-11-534-312/local/-/media/JacksonMS/JacksonMS/2014/04/15//1397579162000-1397527952000-4-14-nats.jpg?width=1200&disable=upscale&format=pjpg&auto=webp)
As MLB honors Jackie Robinson, diversity is lagging
![Why every MLB player is wearing No. 42 today](https://www.newsnationnow.com/wp-content/uploads/sites/108/2022/04/GettyImages-515303324.jpg?w=2536)
The only day MLB players can wear No. 42? Jackie Robinson Day
![Why every MLB player is wearing No. 42 today](https://media.nbcsportschicago.com/2023/05/web-210914-pirates-21-roberto-clemente-3.jpg?quality=85&strip=all&fit=2253%2C1267)
MLB allows more players to wear No. 21 to honor Roberto Clemente – NBC Sports Chicago
![Why every MLB player is wearing No. 42 today](https://c8.alamy.com/comp/2MK4T8N/players-wear-no-42-on-their-jerseys-in-honor-of-jackie-robinson-day-during-a-baseball-game-between-the-philadelphia-phillies-and-the-new-york-mets-monday-april-15-2019-in-philadelphia-ap-photoderik-hamilton-2MK4T8N.jpg)
Players wear No. 42 on their jerseys in honor of Jackie Robinson Day during a baseball game between the Philadelphia Phillies and the New York Mets, Monday, April 15, 2019, in Philadelphia. (
![Why every MLB player is wearing No. 42 today](https://cdnph.upi.com/pv/upi/a6973532562cacd5221888c0d5b944c0/PITTSBURGH-PIRATES-ST-LOUIS-CARDINALS.jpg)
Photo: Players Wear Number 42 On Jackie Robinson Day - SLP2023041503
![Why every MLB player is wearing No. 42 today](https://upload.wikimedia.org/wikipedia/commons/thumb/2/2d/Jackie_Robinson%2C_Brooklyn_Dodgers%2C_1954.jpg/1200px-Jackie_Robinson%2C_Brooklyn_Dodgers%2C_1954.jpg)
Jackie Robinson - Wikipedia