Bobby Wagner's miserable 2022 season just got at least somewhat brighter ... TMZ Sports has learned he won't face criminal charges for tackling a field invader earlier this year.

A spokesperson for the Santa Clara Police Department tells us ... after investigating the Oct. 3 "Monday Night Football" incident, police "did not file charges with the Santa Clara County District Attorneys Office."

Cops had initially launched the probe on Oct. 4 ... after Alexander Taylor claimed he was assaulted by Wagner after running onto the field during the L.A. vs 49ers game at Levi's Stadium.