Thornleigh Baseball Club runs as a division of the Thornleigh Sports Club. The other divisions of Thornleigh Sports Club cover Soccer, Softball, Netball, Basketball and Cricket.

Thornleigh Baseball Club was established in 1979 at which time it entered teams in what was then the two year old Ku-ring-gai Baseball Club competition. Over the years and under various League name and structural changes, this has evolved to the current competitions we are now associated with.

Junior teams in the Thornleigh Baseball Club play in competitions run by the Ryde Hornsby Baseball League (RHBL). Seniors play in competitions officiated by Pacific Coast Baseball League (PCBL).

RHBL & PCBL set the competition draw, and arrange certain insurances. They also run coaching, umpiring and scorer clinics from time to time. PCBL also coordinate game umpires for the senior games. Throughout the season team fixtures, match results and progressive point's tables, as well as other general and relevant baseball information can be obtained from:

RHBL website at www.rydehornsby.baseball.com.au/

PCBL website at www.pcbaseballleague.org