The 129th New York State Legislature, consisting of the New York State Senate and the New York State Assembly, met from January 3 to May 3, 1906, during the second year of Frank W. Higgins's governorship, in Albany.

Under the provisions of the New York Constitution of 1894, 50 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 (seven 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. In New York City, the Municipal Ownership League also nominated candidates.

The New York state election, 1905, was held on November 7. No statewide elective offices were up for election this time. Special elections were held to fill the vacancies in the 16th and 24th senatorial districts.

The Legislature met for the regular session at the State Capitol in Albany on January 3, 1906; and adjourned on May 3.

James Wolcott Wadsworth, Jr. (R) was elected Speaker with 106 votes against 34 for George M. Palmer (D) and 6 for Thomas F. Long (M.O.L.).

On April 27, the Legislature re-apportioned the Senate districts, increasing the number to 51. The apportionment was then contested in the courts.

The Legislature also re-apportioned the number of assemblymen per county. Nassau County was separated from the remainder of Queens County; Albany, Broome, Cattaraugus, Cayuga, Onondaga, Oswego and Rensselaer counties lost one seat each; Erie, Monroe and Westchester gained one each; and Kings and Queens counties gained two each.

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