Greggory Walker (born December 1, 1963) is a Republican member of the Indiana State Senate, representing all of Bartholomew County and most of Johnson County. He was first elected in 2006 after ousting Robert D. Garton, the Senate's sitting president pro tempore, in the Republican primary.
In August 2025, Walker announced that he would not pursue reelection to the Indiana Senate.
Walker opposed President Donald Trump's 2025 effort to redistrict Indiana. He accused Trump of violating the Hatch Act by using a federal employee to pressure legislators into redistricting.