The venue for surfing was also confirmed, with the competition taking place at Trestles Beach in the coastal town of San Clemente, roughly 98km from Los Angeles.
Trestles is widely considered to be one of the best surfing locations in California, known for consistent waves and a classic point break.
Baseball will take place at Dodger Stadium, the home of the Los Angeles Dodgers, which also hosted the sport at the 1984 Los Angeles Olympics.
“We’ve promised the world an incredible Olympic Games and today we’re proud to share the plan that will make it happen,” LA28 chief executive Reynold Hoover said in a statement.
“The 2028 Olympic venue plan invites communities from across the region to celebrate the Games coming to their backyard with the most exciting sports staged at some of the world’s top-tier existing stadiums and arenas, famous beaches and purpose-built temporary structures.”
Los Angeles Mayor Karen Bass said the venue plan announced on Tuesday would “bring the Games to all corners of our city like never before”.
“From the Sepulveda Basin to the iconic shores of Venice Beach, our world-famous neighbourhoods as well as our hidden gems will be on full display for all to experience and enjoy,” Bass said.
Other event venues announced on Tuesday include horse racing’s Santa Anita Park, which will host the equestrian events and Anaheim’s Honda Center, which will host volleyball.