Glenn David Otto Jr. (born March 11, 1996) is an American professional baseball pitcher in the Houston Astros organization.

[5] Otto split 2019 between the GCL Yankees and Tampa Tarpons, compiling a 3–3 record with a 3.23 ERA and 74 strikeouts over 61+1⁄3 innings.

[4] On July 29, 2021, Otto, along with Josh Smith, Ezequiel Durán, and Trevor Hauver were traded to the Texas Rangers in exchange for Joey Gallo and Joely Rodríguez.

[12] He was assigned to the Round Rock Express of the Triple-A West following the trade, going 2–1 with a 2.70 ERA and 19 strikeouts over 20 innings.

[13][14] On August 27, Texas selected Otto's contract and promoted him to the major leagues to make his MLB debut that night versus the Houston Astros.

[23] He made 3 starts for the Triple–A El Paso Chihuahuas, logging an 0–2 record and 7.94 ERA with 4 strikeouts across 5+2⁄3 innings.