The following contains the team squads for the Beijing 2008 Summer Olympics.

Canada

The roster for the Canada national baseball team was as follows. Pete Orr was originally named to the team, but pulled out when he was called up to the major league roster of the Washington Nationals. He was replaced by 22-year-old Emmanuel Garcia. Scott Richmond was also removed from the team when he was called up by the Toronto Blue Jays. Pitcher James Avery was named as a replacement.

China

The roster for the China national baseball team was as follows.

Chinese Taipei

The roster for the Chinese Taipei national baseball team was as follows.

Cuba

The roster for the Cuba national baseball team was as follows. Yunieski Maya and Yulieski González were originally named, but were replaced with Miguel Lahera and Elier Sánchez.

Japan

The roster for the Japan national baseball team was as follows.

South Korea

The roster for the South Korea national baseball team was as follows. Im Tae-Hoon had been originally named, but was replaced with Yoon Suk-Min.

Netherlands

The roster for the Netherlands national baseball team was a follows.

United States

The roster for the United States national baseball team was as follows.