Joseph Crosthwait

{{Short description|British astronomer}}

{{Use dmy dates|date=April 2022}}

{{Infobox scientist

| name = Joseph Crosthwait

| image =

| image_size =

| birth_name =

| birth_date = 1681{{cite book |last1=Hockey |first1=Thomas |last2=Trimble |first2=Virginia |last3=Williams |first3=Thomas R |title=Biographical Encyclopedia of Astronomers |date=2007 |publisher=Springer |isbn=978-0-387-31022-0 |page=263 |url=https://books.google.com/books?id=t-BF1CHkc50C&q=%22joseph+crosthwait%22&pg=PA263 |accessdate=30 November 2018}}

| birth_place = England

| death_date =

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| nationality = English

| field = Astronomy

| workplaces = The Royal Observatory, Greenwich

}}

Joseph Crosthwait was chief assistant to John Flamsteed, the first Astronomer Royal.

Originally from Cumberland, Crosthwait came to the Observatory in 1708 and remained there until Flamsteed's death in 1719.{{cite web |last1=Dolan |first1=Graham |title=People: Joseph Crosthwait |url=http://www.royalobservatorygreenwich.org/articles.php?article=1150 |website=The Royal Observatory Greenwich |accessdate=30 November 2018}} Along with Flamsteed's widow, Margaret,{{cite book |last1=Brück |first1=Mary |title=Women in Early British and Irish Astronomy: Stars and Satellites |date=2009 |publisher=Springer |isbn=978-90-481-2472-5 |page=4}} and Abraham Sharp, he finalised publication of Flamsteed's Historia Coelestis Britannica and Atlas Coelestis.