| Franciszek Januszewski | |
| Office: | First President of the Józef Piłsudski Institute of America |
| Term Start: | 1943 |
| Term End: | 1944 |
| Successor: | Stefan Łodzieski |
| Office2: | Third President of the Józef Piłsudski Institute of America |
| Term Start2: | 1951 |
| Term End2: | 1953 |
| Successor2: | Ignacy Nurkiewicz |
| Birth Date: | November 23, 1886 |
| Birth Place: | Łomża, Congress Poland |
| Death Date: | June 10, 1953 |
| Death Place: | Ann Arbor, Michigan, USA |
| Restingplace: | Detroit, Michigan, USA |
| Nationality: | Polish-American |
Franciszek Januszewski (November 23, 1886 – June 10, 1953) was a Polish-American social activist and the publisher of Detroit's Dziennik Polski. He was also one of the founders of the Józef Piłsudski Institute of America and its president twice (1943–44 and 1951–53).
Born on November 23, 1886, in Łomża, Januszewski became active in the Polish Socialist Party in 1905 and, fearing arrest, had to immigrate to the United States two years later. He joined the local "Sokół" club in Cleveland, Ohio, where he finished the Business College. In 1912, he moved to Detroit and became active in the Polish National Defense Committee in Chicago. In 1913. Januszewski started working for Dziennik Polski in Detroit as an advertising agent. He eventually became the owner of the journal in 1930 and largely contributed to its expansion.
After the outbreak of World War II, he worked for the cause of Polish independence. He was one of the initiators of New York's Józef Piłsudski Polish National Defense Committee (1942). He served as vice-president and president of the National Committee of Americans of Polish Extraction (KNAPP) until 1946. He co-organized and led the Organizational Committee of the Józef Piłsudski Institute of America and became the first president of the Institute, serving in 1943–1944. Elected president once again in 1951, he fulfilled the function until his sudden death two years later on June 10, 1953.