The Tự Đức Bảo Sao (chữ Hán: 嗣德寶鈔) was a series of large denomination Vietnamese cash coins produced under the reign of Emperor Tự Đức from 1861 to complement the contemporary Tự Đức Thông Bảo (嗣德通寶) copper and zinc cash coins with larger nominal values. These coins were very badly received by the general population as their intrinsic value was relatively low compared to their nominal value and for this reason the Vietnamese government reduced the value of a single Tiền to 50 văn and allowed these coins to be used for the payment of taxes.
The Tự Đức Bảo Sao is the first Vietnamese cash coin series that uses the denomination văn (文) replacing the earlier weight based denomination of phân (分).

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