Liu Siyu

{{short description|Chinese tennis player}}

{{Infobox tennis biography

|name = Liu Siyu

|image =

|caption =

|fullname =

|native_name = 刘思宇

|native_name_lang = zh

|country = {{CHN}}

|residence =

|birth_date = {{birth date and age|df=yes|1995|11|1}}

|birth_place =

|height = {{convert|1.91|m|abbr=on}}

|weight =

|turnedpro =

|plays =

|careerprizemoney = $18,440

|singlesrecord = 0–0 (at ATP Tour level, Grand Slam level, and in Davis Cup)

|singlestitles = 0

|highestsinglesranking = No. 906 (11 October 2014)

|currentsinglesranking =

|doublesrecord = 0–1 (at ATP Tour level, Grand Slam level, and in Davis Cup)

|doublestitles = 0

|highestdoublesranking = No. 1076 (9 August 2014)

|currentdoublesranking =

|updated = 1 May 2017

}}

{{family name hatnote|Liu (劉)|lang=Chinese}}

Liu Siyu (born 1 November 1995) is a Chinese tennis player.

Liu has a career high ATP singles ranking of 906 achieved on 11 October 2014. He also has a career high ATP doubles ranking of 1076 achieved on 9 August 2014.

Liu made his ATP main draw debut at the 2014 China Open in the doubles draw partnering Ning Yuqing.