Willard H. Mase (June 10, 1834 – January 18, 1894) was an American hat manufacturer, banker, and politician from New York.

Mase was born on June 10, 1834, in Prattsville, New York.^[1]

Mase moved to Matteawan at a young age, and he played a major role in the incorporation of the village. He served as village president for a number of years.^[1] He initially worked as a practical hatter, later becoming a wool and straw hat manufacturer. He was superintendent of the Matteawan Hat Manufacturing Co., president of the Matteawan Savings Bank, and manager of the Hudson River State Hospital in Poughkeepsie.^[1]

In 1886, Mase was elected to the New York State Assembly as a Republican, representing the Dutchess County 1st District. He served in the Assembly in 1887,^[1] 1888,^[2] 1889,^[3] 1890,^[4] and 1891.^[5]

Mase was an alternate delegate to the 1884 Republican National Convention^[6] and a delegate to the 1892 Republican National Convention.^[7] He was also elected delegate to the 1894 New York State Constitutional Convention, but he died before the convention began.^[8]

Mase died at Stanwix Hall in Albany on January 18, 1894.^[9] He was buried in Saint Luke's Church Cemetery in Beacon.