Logan Keith Gilbert (born May 5, 1997) is an American professional baseball pitcher for the Seattle Mariners of Major League Baseball (MLB). He made his MLB debut in 2021 and was an All-Star in 2024.

Gilbert attended Wekiva High School in Apopka, Florida. He pitched and played first base in high school. He was named his team MVP his senior season. He reached 90 miles per hour on his fastball in 2014 and was the 500th best high school prospect in 2015, according to Perfect Game. He was not drafted out of high school and enrolled at Stetson University to play baseball for the Stetson Hatters.

As a freshman in 2016, Gilbert appeared in 21 games with five starts, going 2–1 with a 2.74 earned run average (ERA) and 43 strikeouts in 49 innings. After his freshman season, he pitched for the Bethesda Big Train in the Cal Ripken Collegiate Baseball League, posting a 1.70 ERA with 28 strikeouts over 26+1⁄3 innings. As a sophomore in 2017, he appeared in 15 games with 12 starts, and went 10–0 with a 2.02 ERA and 107 strikeouts in 89 innings and was named the Atlantic Sun Conference (ASUN) Pitcher of the Year. After the 2017 season, he played collegiate summer baseball with the Orleans Firebirds of the Cape Cod Baseball League and was named a league all-star. As a junior in 2018, he pitched to an 11–2 record and a 2.72 ERA over 16 starts and was again named the ASUN Pitcher of the Year.

Gilbert was considered one of the top 20 prospects for the 2018 Major League Baseball draft. He was selected 14th overall by the Seattle Mariners. He signed for $3.88 million on June 16. He was shut down for the remainder of 2018 after contracting mononucleosis.

Gilbert made his professional debut as the 2019 Opening Day starter of the West Virginia Power. After five starts with a 1–0 record and 1.59 ERA, he was promoted to the High-A Modesto Nuts. In 12 starts with Modesto, he went 5–3 with a 1.73 ERA, striking out 73 batters over 62+1⁄3 innings. He was promoted to the Double-A Arkansas Travelers in July. Over nine starts with Arkansas, he pitched to a 4–2 record with a 2.88 ERA.

Gilbert did not play in an official game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic. He pitched in an intrasquad exhibition game in Seattle in July, before the start of the MLB season. He was also on the Mariners' initial 60-man roster but stayed in the alternate training site in Tacoma.

Entering 2021, Gilbert was a consensus top 40 prospect. He started the season with the Tacoma Rainiers, earning a win in his only Triple-A game. On May 13, Gilbert was promoted to the major leagues and made his debut, starting against the Cleveland Indians. He took the loss, allowing four runs in four innings. On June 6, he earned his first career win, striking out seven Los Angeles Angels batters and allowing one run in five innings. In his rookie season, Gilbert was 6–5 in 24 starts, with a 4.68 ERA and 128 strikeouts in 119+2⁄3 innings.

Gilbert was named the American League (AL) Pitcher of the Month for April 2022, in which he went 3–0 with 22 strikeouts in 20 innings. On September 30, Gilbert allowed one run in eight innings against the Oakland Athletics. His start helped the Mariners clinch a playoff spot for the first time since 2001.