Dennis McCarthy (March 19, 1814 – February 14, 1886) was an American manufacturer and politician from New York.

[1] He attended Valley Academy in Salina and engaged in the manufacturing of salt.

In the early 1840s he went into business operating a general store with his brother-in-law Silas Titus.

In 1878 mayor James J. Belden formed a committee of citizens, St. Joseph's Hospital Aid Society, to look after the interests of St. Joseph's Hospital.

[3] He was a member of the New York State Senate from 1876 to 1885, sitting in the 99th, 100th, 101st, 102nd, 103rd, 104th, 105th, 106th, 107th and 108th New York State Legislatures; and was President pro tempore in 1881, 1884 and 1885.