James J. O'Day (born May 23, 1954 in Worcester) is an American social worker and politician in the Massachusetts House of Representatives.

He is also a member of the Steering, Policy, and Scheduling Committee.

O'Day is married to Marybeth Murphy, with whom he has four sons: Tyler, Max, Patrick, and Kevin.

[2] The family resides in West Boylston, Massachusetts.

This article about a member of the Massachusetts House of Representatives is a stub.