Su Tseng-chang Yu Shyi-kun The 2006 Democratic Progressive Party chairmanship by-election was held on January 15, 2006 in Taiwan.

In December 2005, chairperson Su Tseng-chang resigned as a result of failing to win ten of the twenty-three positions in the 2005 local elections.

It is commonly believed that Yu's successful campaign symbolized the fact that President Chen Shui-bian's Justice Alliance was still in power within the party.

After Su Tseng-chang, also a member of the Justice Alliance, was appointed the premier, his term was relatively more stable as a result of the mutual cooperation between the three leaders.

On the other hand, former chairperson Lin Yi-hsiung left the party as a result of the loss of Wong Chin-chu.