Jacob Ryan Lamb (born October 9, 1990) is an American professional baseball infielder in the San Francisco Giants organization.

He made his Major League Baseball (MLB) debut with the Arizona Diamondbacks in 2014, and was an All-Star in 2017.

[1] After graduating high school, the Pittsburgh Pirates selected Lamb in the 38th round of the 2009 MLB Draft, but he followed through with his commitment to attend the University of Washington.

[5] Lamb played for the Visalia Rawhide of the High–A California League in 2013, but appeared in only 64 games due to a hamstring injury.

[9] After the Diamondbacks traded Martín Prado on July 31, they promoted Lamb to the major leagues on August 7.

During the 2016 season, he hit .291 with 20 home runs and 61 RBIs in the first half,[11] and was a finalist for the last All Star spot in the All-Star Final Vote.

[12] After struggling in the second half, in which he hit .197 (46-for-234), Lamb finished the season with a .249 average, 29 home runs, 91 RBIs, and nine triples.

On September 14, 2020, Lamb signed a major league contract with the Oakland Athletics and was added to their active roster.

[20] In 13 games for Oakland as Matt Chapman's replacement after he underwent surgery, Lamb slashed .267/.327/.556 with three home runs and nine RBIs and 45 at-bats.

[26] Lamb was designated for assignment by the Blue Jays following Breyvic Valera's return from the COVID-19 related injured list.

On March 29, 2023, Lamb had his contract selected, making the Angels' Opening Day roster.

[34] On July 14, 2023, Lamb signed a minor league contract with the New York Yankees organization.

[36] On December 21, 2023, Lamb signed a minor league contract with the Pittsburgh Pirates organization.