Zhang Da'an (張大安) (died 684) was an official of the Chinese dynasty Tang Dynasty, serving as a chancellor during the reign of Emperor Gaozong.

Zhang Da'an was one of the sons of Zhang Gongjin (張公謹), a key follower of Li Shimin (the eventual Emperor Taizong) the Prince of Qin, a son and major general of Tang's founder Emperor Gaozu, who supported Li Shimin in his rivalry with his brother Li Jiancheng the Crown Prince. When Li Shimin feared that Li Jiancheng was about to kill him in 626, Zhang Gongjin was a major proponent of launching a preemptive strike against Li Jiancheng and another brother who supported Li Jiancheng, Li Yuanji the Prince of Qi, and when Li Shimin did so (in an incident known as the Incident at Xuanwu Gate), Zhang defended Li Shimin's mansion against counterattacks by Li Jiancheng's and Li Yuanji's followers after Li Shimin killed Li Jiancheng and Li Yuanji. Zhang Gongjin died in 632 at the age of 38 and was eventually posthumously created the Duke of Tan and honored in one of the Portraits at Lingyan Pavilion, reserved for the greatest contributors to Emperor Taizong's reign.

It is not known when Zhang Da'an himself was born, but it is known that he had at least two older brothers, Zhang Daxiang (張大象) and Zhang Dasu (張大素). Less is known about Zhang Da'an's career than his father's. By 677, he was serving on the staff of Li Xian, the crown prince of Emperor Gaozong (Emperor Taizong's son), when he was given the designation Tong Zhongshu Menxia Sanpin (同中書門下三品), making him a chancellor de facto. He and another staff member, Liu Nayan (劉訥言), were key contributors in a project led by Li Xian in writing commentaries for the Book of Later Han, the official history of the Eastern Han Dynasty. In 680, Li Xian, who had lost the favor of Emperor Gaozong's powerful wife Empress Wu (later known as Wu Zetian), was accused of plotting treason, deposed, and exiled. Most of the staff members were pardoned, but Liu was exiled, and Zhang was also accused of flattering the former crown prince and demoted to the post of Pu Prefecture (普州, roughly modern Ziyang, Sichuan). He died in 684, while serving as the military advisor to the prefect of Heng Prefecture (橫州, roughly modern Nanning, Guangxi).

張大安（7世紀 - 684年），唐朝官員，唐高宗年間為宰相。

張大安是張公謹的兒子。張公謹是唐朝開國之君唐高祖之子和大將秦王李世民（後為唐太宗）的關鍵追隨者，在李世民與其兄皇太子李建成的對抗中支持李世民。武德九年（626年），李世民害怕李建成準備要殺他，張公謹成為對李建成及支持李建成的其弟齊王李元吉實施先發制人攻擊的主要策劃者之一，于是李世民發動了玄武門之變，在李世民殺李建成、李元吉之後，二人的追隨者反攻，張公謹守衛秦王府邸。貞觀六年（632年），張公謹卒，享年三十九，追封郯國公，畫圖形于為太宗統治貢獻最大者而設的凌煙閣。

張大安本人生年不詳，至少有兩兄張大象、張大素。張大安的仕途記載比其父少。儀鳳二年（677年）四月，他在太子李賢左庶子任上被授同中書門下三品，為實質宰相。他和太子洗馬劉訥言、洛州司戶格希玄、學士許叔牙、成玄一、史藏諸、周寶寧等作為當時學者都是李賢注《後漢書》的主要工作者。恆州司法參軍蘇瑰為喪母而哀痛傷身，張大安表舉其孝悌，使其得擢相王府錄事參軍。永隆元年（680年），已失寵于唐高宗有權勢的妻子武皇后（即後來的武則天）的李賢被控謀反，被廢黜貶謫。他的大多數幕僚都被赦免，但劉訥言被流放振州，八月張大安也以阿附原太子的罪名貶普州刺史。永淳二年（682年）五月仍在任，去嚴州題名。他于光宅元年（684年）去世于橫州司馬任上。

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