Michael James Sis (born January 9, 1960) is an American prelate of the Roman Catholic Church.

[2] From 1990 to 1992, Sis left Cristo Rey and the university to serve as the associate pastor at St. Mary's Cathedral Parish in Austin.

He was reassigned in 2009 as pastor of St. Thomas More Parish in Austin, then in 2010 was named the vicar general and moderator of the curia of the diocese.

Sis in January 2019 released a list of 13 clerics from the diocese with credible accusations of sexual abuse of children.

[5] In December 2023, Sis organized an interfaith Hanukkah celebration to emphasize his condemnation of anti-semitism and support for Jews.