| Title1: | Circuit Judge |
| Order2: | 34th |
| Title2: | Speaker of the Oregon House of Representatives |
| Term Start2: | 1931 |
| Term End2: | 1932 |
| Predecessor2: | R. S. Hamilton |
| Successor2: | Earl Snell |
| Office3: | Member of the Oregon House of Representatives |
| Birth Date: | May 27, 1882 |
| Birth Place: | Polo, Illinois |
| Death Place: | Portland, Oregon |
| Party: | Republican |
Frank Lonergan was a Republican politician in the U.S. state of Oregon. A longtime member of the Oregon House of Representatives, he served as speaker for the 1931 regular session of the state legislature.[1] He became a judge in Multnomah County in 1945[2] He notably oversaw the conviction of district attorney William Langley for failure to prosecute gambling, and ordered him removed from office.[3]
In 1943, in Boston, he was elected the Grand Exalted Ruler of the Benevolent and Protective Order of Elks.[4]
Longeran was born in Polo, Illinois, the ninth of 10 children. He was a football star, team captain, and class president at Notre Dame University. He moved to Portland to accept a job offer by telegram, to teach and coach at the University of Portland (then known as Columbia University).