Zhang Song (died January or February 213),[a][1] courtesy name Ziqiao, was an official and adviser serving under the warlord Liu Zhang during the late Eastern Han dynasty of China.

Zhang Song was born in Shu Commandery (蜀郡), which is in present-day Chengdu, Sichuan.

He started his career as an adviser to Liu Zhang, the Governor of Yi Province (益州牧) during the Eastern Han dynasty.

If he was able to use Zhang Lu's grain stores then launch an invasion of Yi province, who could stop him?"

If you don't obtain the support of Liu Bei then we risk to be surrounded by enemies from outside and traitors from inside.

Then the situation would be really desperate.”[7] Liu Zhang heeded Zhang Song's advice and ordered his subordinate Fa Zheng to lead 4,000 men to welcome Liu Bei into Yi Province.

In addition, he presented Liu Bei with several precious gifts.

Huang Quan opposed the decision while his attendant Wang Lei (王累), from Guanghan (廣漢) hanged himself at the city gate in protest.

He also used this opportunity to learn more crucial information about Yi Province such as the geography, supplies and deployment of military forces.

Zhang Song even drew a map of Yi Province and gave it to Liu Bei.

[9][10] Liu Bei led an expedition force of several ten thousands soldiers into Yi Province after leaving behind Zhuge Liang, Guan Yu, Zhang Fei and Zhao Yun to guard Jing Province.

[11] At the beginning of the year 213,[1] Zhang Song stayed at Chengdu while Fa Zheng and Meng Da accompanied Liu Bei.

Hearing about this, Zhang Song sent a letter to Fa Zheng and Liu Bei, arguing that with success so close, they couldn't leave.

When Liu Bei heard about Zhang Song's death, he exclaimed, "Junjiao[b] killed my spy!

[13] Zhang Biao (張表), whose courtesy name was Boda (伯達), was chosen to administer the south after Ma Zhong.