The last time the Brisbane Broncos won a premiership was in 2006. They defeated Melbourne in the grand final that year to claim their sixth premiership title.
If asking about the Denver Broncos (American football), their last Super Bowl win was in 2016, Super Bowl 50, where they defeated the Carolina Panthers.
Please clarify if the question refers to the Brisbane Broncos rugby league team or the Denver Broncos American football team.
