A man who worked for a community organisation in various towns of Queensland's South Burnett region has allegedly sexually assaulted multiple teenage boys.

Kingaroy detectives have charged a 71-year-old South Burnett man with 20 offences, including indecent treatment of a child under 16.

However, police are continuing to appeal for anyone with information to help investigations.

Police will allege the offences were committed against several teenage boys between March and November last year.

A Queensland Police Service spokesman said detectives hoped more victims would come forward.