The 139th New York State Legislature, consisting of the New York State Senate and the New York State Assembly, met from January 5 to April 20, 1916, during the second year of Charles S. Whitman's governorship, in Albany.

Under the provisions of the New York Constitution of 1894, re-apportioned in 1906 and 1907, 51 Senators and 150 assemblymen were elected in single-seat districts; senators for a two-year term, assemblymen for a one-year term. The senatorial districts were made up of entire counties, except New York County (twelve districts), Kings County (eight districts), Erie County (three districts) and Monroe County (two districts). The Assembly districts were made up of contiguous area, all within the same county.

At this time there were two major political parties: the Republican Party and the Democratic Party.

The New York state election, 1915, was held on November 2. No statewide elective offices were up for election. The voters rejected all amendments proposed by the Constitutional Convention of 1915.

The Legislature met for the regular session at the State Capitol in Albany on January 5, 1916; and adjourned on April 20.

Thaddeus C. Sweet (R) was re-elected Speaker, with 94 votes against 45 for Joseph M. Callahan (D).

On February 8, the Legislature elected three Regents of the University of the State of New York: William Berri to fill the vacancy caused by the death of St. Clair McKelway, for a term to end on April 1, 1917; James Byrne to fill the vacancy caused by the death of Andrew J. Shipman, for a term to end on April 1, 1920; and Walter Guest Kellogg for a term of twelve years, beginning on April 1, 1916.

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