| Frederick W. Dallinger | |
| Office: | Judge of the United States Customs Court |
| Term Start: | July 8, 1932 |
| Term End: | October 31, 1942 |
| Appointer: | Herbert Hoover |
| Predecessor: | Israel F. Fischer |
| Successor: | Charles Drummond Lawrence |
| State1: | Massachusetts |
| District1: | 8th |
| Term Start1: | March 4, 1915 |
| Term End1: | March 3, 1925 |
| Predecessor1: | Frederick Simpson Deitrick |
| Successor1: | Harry Irving Thayer |
| Term Start2: | November 2, 1926 |
| Term End2: | October 1, 1932 |
| Predecessor2: | Harry Irving Thayer |
| Successor2: | Arthur Daniel Healey |
| Office3: | Member of the Massachusetts Senate |
| Term Start3: | January 1, 1896 |
| Term End3: | January 3, 1900 |
| Birth Name: | Frederick William Dallinger |
| Birth Date: | 2 October 1871 |
| Birth Place: | Cambridge, Massachusetts |
| Resting Place: | Center Lovell Cemetery Center Lovell, Maine |
| Party: | Republican |
| Residence: | Center Lovell, Maine |
| Education: | Harvard University (A.B., A.M.) Harvard Law School (LL.B.) |
Frederick William Dallinger (October 2, 1871 – September 5, 1955) was a United States representative from Massachusetts and a judge of the United States Customs Court.
Born on October 2, 1871, in Cambridge, Middlesex County, Massachusetts, Dallinger attended the common schools and graduated from Cambridge Latin School in 1889. He received an Artium Baccalaureus degree in 1893 from Harvard University, an Artium Magister degree in 1894 from the same institution and a Bachelor of Laws in 1897 from Harvard Law School and was admitted to the bar the same year. He was a member of the Massachusetts House of Representatives from 1894 to 1895 and a member of the Massachusetts Senate from 1896 to 1899. He was in private practice in Boston, Massachusetts from 1897 to 1932. He was a public administrator for Middlesex County, Massachusetts from 1897 to 1932. He was President of the Cambridge Chamber of Commerce. He was a lecturer for Harvard Law School in 1912.
Dallinger was elected as a Republican to the United States House of Representatives of the 64th United States Congress and to the four succeeding Congresses, serving from March 4, 1915 to March 3, 1925. He was Chairman of the Committee on Elections No. 1 in the 66th and 67th United States Congresses and the Committee on Education in the 68th United States Congress. He was not a candidate for renomination in 1924, but was an unsuccessful candidate for the Republican nomination for United States Senator. He was subsequently elected to the 69th United States Congress to fill the vacancy caused by the death of his successor, United States Representative Harry Irving Thayer. He was reelected to the 70th, 71st and 72nd United States Congresses and served from November 2, 1926, until his resignation effective October 1, 1932, having been appointed to the federal bench.
Dallinger was nominated by President Herbert Hoover on June 20, 1932, to a seat on the United States Customs Court vacated by Judge Israel F. Fischer. He was confirmed by the United States Senate on June 28, 1932, and received his commission on July 8, 1932. His service terminated on October 31, 1942, due to his retirement. He was succeeded by Judge Charles Drummond Lawrence.
After his retirement from the federal bench, Dallinger engaged in agricultural pursuits. He later retired and resided in Center Lovell, Maine. He died on September 5, 1955, in North Conway, New Hampshire. He was interred in Center Lovell Cemetery in Center Lovell.