Thomas Alleyn (died 27 March 1631) was a prominent seventeenth century London citizen and the first Master of the College of God's Gift.
He was born the cousin of Edward Alleyn in London.
When Edward Alleyn laid out the Deed of Foundation of the College of God's Gift in Dulwich, which was soon colloquially referred to as "Dulwich College", he stipulated that the Master and Warden should always be unmarried and of Alleyn's blood, and surname, and if the former was impossible then at least of Alleyn's surname.
[2] Thomas met the criteria of being of Edward Alleyn's blood and surname, although he was married.
He died on 27 March 1631 and was succeeded in the post by his cousin Matthias Alleyn who had served as Warden in the period that Thomas had been Master.