Sig Mejdal (/ˈmaɪdəl/ MY-dəl; born December 31, 1965) is the assistant general manager for the Baltimore Orioles of Major League Baseball.

[4] After graduating from UC Davis in 1989,[3] Mejdal worked for NASA and Lockheed Martin's satellite operations unit at the Onizuka Air Force Station.

[2][7][21] Hiring Mejdal to apply an analytics-based decision tree on their player choices part of the front office's effort to revitalize the team and address performance issues from prior seasons.

[14] Employing his skills as a former NASA researcher, he helped create the STOUT system in St. Louis, named after the combination of "stat" and "scout," for making player choices.

[4][25] Mejdal was instrumental in the development of the Houston Astros' farm system and the team's improvement from three consecutive seasons with at least 106 losses to winning the World Series in 2017.

[27] In 2018, the Baltimore Orioles began rebuilding their team by hiring Mike Elias, previously from the Houston Astros, as General Manager.

[29] Key acquisitions, such as trading for ace pitcher Corbin Burnes, have positioned the Orioles as a competitive team in Major League Baseball.