Beatmania III: Append 6thMix is a rhythm game developed by Konami. It is the third game in the beatmania III series, a spin-off of the beatmania series. It is part of the BEMANI franchise.

The game is played with a controller with one turn table, one foot pedal and 5 keys, three white and two black. On the screen you will see bars moving from the top to bottom in columns representing each of the keys, foot pedal and the turntable. When the bars reach the judgement line it is time to scratch.

First beatmania III game to include LONG version of songs. It is the final beatmania III version with INTERNET RANKING. As with its beatmania conterpart, the SEPARATE playframe was added, giving black keys their own lane. Game modifiers can be accessed from the song selection screen.

As the name entails, the game focuses on bringing over the songs from beatmania 6thMIX, all 27 new songs from that version were added. Additionally 3 LONG versions of songs was added. 159 old songs return from the previous entry. The total number of songs is 189.