William Thomas "Mox" McQuery (June 28, 1861 – June 12, 1900) was a Major League Baseball first baseman. He played for the Cincinnati Outlaw Reds (1884) of the Union Association, the Detroit Wolverines (1885) and the Kansas City Cowboys (1886), both of the National League, and the Syracuse Stars (1890) and Washington Statesmen (1891), both of the American Association. He was a native of Garrard County, Kentucky.
On September 28, 1885 he became the second Wolverine (after George Wood) to hit for the cycle, in a 14–2 Detroit win against the Providence Grays at Recreation Park.
In the 1890 season, he finished second on his team and tenth in the league with a .308 batting average. He also had career highs in nine other offensive categories. His career totals include 417 games played, 429 hits, 13 home runs, 160 RBI, 231 runs scored, and a lifetime batting average of .271.
McQuery was a patrol officer for the Covington Police Department when he was killed in the line of duty. He had stopped a horse-drawn streetcar that contained two men wanted for murder. The criminals opened fire, striking him in the chest, and he later died as result of his injuries. "Big Mox" was buried at Linden Grove Cemetery in Covington, Kentucky.