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|Centuries:||1st century – 2nd century – 3rd century|
|Decades:||140s 150s 160s – 170s – 180s 190s 200s|
|Years:||172 173 174 – 175 – 176 177 178|
|175 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||928|
|Chinese calendar||甲寅年 (Wood Tiger)
2871 or 2811
— to —
乙卯年 (Wood Rabbit)
2872 or 2812
|Coptic calendar||−109 – −108|
|- Vikram Samvat||231–232|
|- Shaka Samvat||97–98|
|- Kali Yuga||3276–3277|
|Iranian calendar||447 BP – 446 BP|
|Islamic calendar||461 BH – 460 BH|
|Minguo calendar||1737 before ROC
|Seleucid era||486/487 AG|
|Thai solar calendar||717–718|
Year 175 (CLXXV) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Piso and Iulianus (or, less frequently, year 928 Ab urbe condita). The denomination 175 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
- Marcus Aurelius suppresses a revolt of Avidius Cassius, governor of Syria, after the latter proclaims himself emperor.
- Avidius Cassius fails in seeking support for his rebellion and is assassinated by Roman officers. They send his head to Aurelius, who persuades the Senate to pardon Cassius's family.
- Commodus, son of Marcus Aurelius and his wife Faustina, is named Caesar.
- M. Sattonius Iucundus, decurio in Colonia Ulpia Traiana, restores the Thermae of Coriovallum (modern Heerlen ) there are sources that state this happened in the 3rd century.
- Confucian scholars try to ensure their capacity in the royal court of China. They are massacred by the eunuchs.
- Gan Ning, general of Wu (d. 218)
- Sun Ce, elder brother of founder of the Wu Kingdom, Sun Quan (d. 200)
- Wei Yan, general of Shu (d. 234)
- Yang Xiu, advisor to Cao Cao (d. 219)
- Zhou Yu, militarist and strategist of the Three Kingdoms of China (d. 210)
- July – Avidius Cassius, Roman Emperor (usurper) (b. c. 130 AD)
- Concordius of Spoleto, Christian martyr
- Faustina the Younger, Roman empress (b. c. 130 AD)