The 1954 United States Senate elections was a midterm election in the first term of Dwight D. Eisenhower's presidency. The 32 Senate seats of Class 2 were contested in regular elections, and six special elections were held to fill vacancies. Eisenhower's Republican party lost a net of two seats to the Democratic opposition. This small change was just enough to give Democrats control of the chamber with the support of an Independent who agreed to caucus with them; he later officially joined the party in April 1955.
The 1896–97 United States Senate elections were held on various dates in various states. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1896 and 1897, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 3.
The 1874–75 United States Senate elections were held on various dates in various states. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1874 and 1875, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 1.
The 1876–77 United States Senate elections were held on various dates in various states, coinciding with Rutherford B. Hayes's narrow election as president. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1876 and 1877, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 2.
The 1898–99 United States Senate elections were held on various dates in various states. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1898 and 1899, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 1.
The 1902–03 United States Senate elections were held on various dates in various states. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1902 and 1903, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 3.
The 1904–05 United States Senate elections were held on various dates in various states, coinciding with President Theodore Roosevelt's landslide election to a full term and the 1904 House of Representatives elections. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1904 and 1905, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 1.
The 1878–79 United States Senate elections were held on various dates in various states. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1878 and 1879, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 3.
The 1880–81 United States Senate elections were held on various dates in various states, coinciding with the presidential election of 1880. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1880 and 1881, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 1.
The 1884–85 United States Senate elections were held on various dates in various states, coinciding with the presidential election of 1884. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1884 and 1885, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 3.
The 1890–91 United States Senate elections were held on various dates in various states. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1890 and 1891, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 3.
The 1899 United States Senate election in Massachusetts was held during January 1899. Republican incumbent Henry Cabot Lodge won election to a second term easily.
The 1855 United States Senate special election in Massachusetts was held during January 1855. Henry Wilson was elected to fill the remainder of the term left vacant by the resignation of Edward Everett.
The 1859 United States Senate election in Massachusetts was held during January 1859. Incumbent Senator Henry Wilson, who had been elected in 1855 to fill the unexpired term of Edward Everett, was re-elected easily to a full term as a member of the Republican Party.
The 1865 United States Senate election in Massachusetts was held during January 1865. Incumbent Republican Senator Henry Wilson was re-elected easily to a second term as a member of the Republican Party.
The 1873 United States Senate special election in Massachusetts was held in March 1873 to fill the vacancy left by Senator Henry Wilson, who resigned to become Vice President of the United States. George S. Boutwell won the election.
The 1877 United States Senate election in Massachusetts was held in January 1877. Incumbent Republican Senator George S. Boutwell, who had won a special election for the remainder of Henry Wilson's term, was defeated by reformist U.S. Representative George Frisbie Hoar.
The 1883 United States Senate election in Massachusetts was held in January 1883. Incumbent Republican Senator George Frisbie Hoar was re-elected to a second term in office despite a serious challenge from Democrats and members of his own party.
The 1895 United States Senate election in Massachusetts was held in January 1895. Incumbent Republican Senator George Frisbie Hoar was re-elected to a fourth term in office.
The 1901 United States Senate election in Massachusetts was held in January 1901. Incumbent Republican Senator George Frisbie Hoar was re-elected to a fifth term in office.
