Jan Wejher (1580–1626) was a Polish nobleman, son of Ernest Wejher and Anna Mortęska.
He held many offices and was an officer of the army in the Polish–Lithuanian Commonwealth and a courtier of the Polish king Sigismund III from the age of thirteen.
Wejher accompanied the King in his campaign to crush the rebellion of Duke Charles in Sweden.
He helped defend Gdańsk from the Swedes in their raids in the early 17th century.
Wejher married to Anna Szczawińska, the daughter of the starost of Mirachowo; they had five sons and three daughters: Sons: Daughters: