Ryan Benjamin Rowland-Smith (born 26 January 1983) is an Australian former professional baseball pitcher and current television broadcaster for the Seattle Mariners. He debuted in Major League Baseball (MLB) for the Mariners in 2007 and pitched with the team through 2010. He briefly pitched for the Arizona Diamondbacks in 2014. Rowland-Smith also represented Australia in the 2004 Summer Olympics and three World Baseball Classic tournaments.

Born in Sydney, Rowland-Smith grew up watching MLB games on videocassette. Signed out of high school by the Mariners, he spent the next several years pitching for their minor league teams. Promoted to Seattle for the first time in June 2007, he struck out the first batter he faced, former Mariners' star Ken Griffey Jr. Rowland-Smith began 2008 as a relief pitcher for the Mariners but converted into a starting pitcher in August, pitching in the starting rotation the rest of the year. After his first start in 2009, he went on the disabled list with triceps tendinitis. Rejoining the Mariners in July, he completed the eighth inning in three of his remaining starts for Seattle. In 2010, he made a career-high 20 starts for the Mariners but posted a 1–10 record and a 6.75 earned run average (ERA). Seattle did not offer him a contract after the season.

Over the next three seasons, Rowland-Smith pitched in the minor leagues for several teams. In 2014, he began the season with the Arizona Diamondbacks, much to his excitement as the Diamondbacks were opening the 2014 season in Australia. His time with the Diamondbacks did not last long, as the team designated him for assignment on 18 April. Rowland-Smith pitched for some minor league teams the remainder of the year, then joined the EDA Rhinos of the Chinese Professional Baseball League in 2015. He pitched for the Brisbane Bandits of the Australian Baseball League in January 2017, then retired after the 2017 World Baseball Classic.

Rowland-Smith was born 26 January 1983, in Sydney, Australia. His father is Australian celebrity trainer Rob Rowland-Smith, known as "The Sandhill Warrior," and his mother is a retired high school physical education teacher. Ryan was their third child and had two older sisters. His parents divorced when Ryan was three, and Rowland-Smith grew up with his mother and sisters in Newcastle, New South Wales. He was a baseball fan from childhood, primarily watching video cassettes of the 1992 and 1993 World Series because Major League Baseball was not televised in Australia at the time. Rowland-Smith started playing baseball himself at the age of 12. He graduated from Newcastle High School in December 2000. The Seattle Mariners, one of the only Major League Baseball (MLB) teams that scouted Australia at the time, signed Rowland-Smith as a free agent on 19 November 2000. "I signed it before the ink dried," Rowland-Smith said of his contract. "It was the only opportunity I was going to get."

Rowland-Smith began his pro career in 2001 with the Rookie level Arizona League Mariners. In 17 relief appearances, he allowed just one home run in 33+1⁄3 innings pitched. He split the 2002 season between the Single-A Wisconsin Timber Rattlers and the Short Season-A Everett AquaSox. With Wisconsin to begin the season, he appeared in 12 games (eight starts), posting a 1–2 record and a 6.75 earned run average (ERA). In the middle of the season, he was demoted to Everett. He appeared in 18 games (six starts) with Everett, posting a 4–1 record, a 2.77 ERA, 58 strikeouts, and 58 hits allowed in 61+2⁄3 innings pitched.

In 2003, Rowland-Smith pitched for Wisconsin again, appearing in 13 games. He had a 3–0 record, a 1.11 ERA, and 37 strikeouts in 32+1⁄3 innings. During the year, he also pitched for the Class-A Advanced Inland Empire 66ers. In 15 games with the 66ers, he lost one game, posted a 3.20 ERA, struck out 15, and allowed 12 hits over 19+2⁄3 innings pitched. He had a 1.90 ERA and 52 strikeouts combined between Wisconsin and Inland Empire. Rowland-Smith played the entire 2004 season with Inland Empire, appearing in 29 games. He split the season between the bullpen and the starting rotation, going 5–3 with a 3.79 ERA as a starter. He struck out 119 batters in 992⁄3 innings and held opponents to a .276 batting average.

The Minnesota Twins selected Rowland-Smith in the major league phase of the 2004 Rule 5 draft. On 4 March, the Twins signed him to a one-year contract. He spent most of 2005 spring training with the Twins. Ultimately, Minnesota decided not to keep him on the roster all season, and he was returned to Seattle on 25 March. He spent the season with the Double-A San Antonio Missions, setting a career high with 122 innings pitched. In 33 games (17 starts), he had a 6–7 record, a 4.35 ERA, 102 strikeouts, and 133 hits allowed.

Rowland-Smith split the 2006 season with Inland Empire and San Antonio. With the 66ers, he gave up seven runs (four earned) in 6+1⁄3 innings pitched over seven games. He spent a greater portion of the season with the Missions. On 25 August, he struck out a season-high seven batters in 4+1⁄3 innings. In 23 games (one start) for the Missions, he had a 1–3 record, a 2.83 ERA, 48 strikeouts, and 38 hits allowed in 41+1⁄3 innings. Following the regular season, he played with the Peoria Javelinas in the Arizona Fall League.