| Honorific-Prefix: | Sir |
| François Langelier | |
| Office: | 10th Lieutenant Governor of Quebec |
| Predecessor: | Charles Alphonse Pantaléon Pelletier |
| Successor: | Pierre-Évariste Leblanc |
| Premier: | Lomer Gouin |
| Term Start: | May 5, 1911 |
| Term End: | February 8, 1915 |
| Constituency Mp2: | Quebec-Centre |
| Parliament2: | Canadian |
| Predecessor2: | Joseph-Guillaume Bossé |
| Successor2: | Arthur Cyrille Albert Malouin |
| Term Start2: | February 22, 1887 |
| Term End2: | January 13, 1898 |
| Constituency Mp3: | Mégantic |
| Parliament3: | Canadian |
| Predecessor3: | Louis-Israël Côté dit Fréchette |
| Successor3: | Georges Turcot |
| Term Start3: | June 10, 1884 |
| Term End3: | February 22, 1887 |
| Office4: | Mayor of Quebec City |
| Predecessor4: | Jean-Docile Brousseau |
| Successor4: | Jules-Joseph-Taschereau Frémont |
| Term Start4: | 1882 |
| Term End4: | 1890 |
| Office5: | Member of the Legislative Assembly of Quebec for Portneuf |
| Predecessor5: | Praxède Larue |
| Successor5: | Jean-Docile Brousseau |
| Term Start5: | May 1, 1878 |
| Term End5: | December 2, 1881 |
| Office6: | Member of the Legislative Assembly of Quebec for Montmagny |
| Predecessor6: | Télesphore Fournier |
| Successor6: | Auguste Charles Philippe Robert Landry |
| Term Start6: | December 16, 1873 |
| Term End6: | July 7, 1875 |
| Birth Date: | 24 December 1838 |
| Birth Place: | Sainte-Rosalie, Lower Canada |
| Nationality: | Canadian |
| Party: | Liberal |
| Relations: | Charles Langelier, brother |
| Children: | 9 (3 of whom died young) |
| Profession: | politician |
Sir François Langelier, (24 December 1838 - 8 February 1915) was a Canadian lawyer, professor, journalist, politician, the tenth Lieutenant Governor of Quebec, and author. He was born in Sainte-Rosalie, Lower Canada (now Quebec) and died in Spencer Wood, Sillery, Quebec.
In 1871, he was an unsuccessful candidate to the Legislative Assembly of Quebec for the riding of Bagot. A Liberal, he was elected in an 1873 by-election for the riding of Montmagny. He was defeated in 1875 but was re-elected in 1878 for the riding of Portneuf. He was Commissioner of Crown Lands and Provincial Treasurer from 1878 to 1879. He was defeated in 1881. From 1880 to 1890, he was a municipal councillor in Quebec City and was mayor from 1882 to 1890.
He was elected to the House of Commons of Canada for Mégantic in an 1884 by-election, after the results for the 1882 election were declared void. He was re-elected for Quebec-Centre in the 1887, 1891, and 1896 elections. He resigned in 1898 when he was appointed a puisne judge of the Quebec Superior Court for the district of Montreal.
He was knighted in 1907 and was elected to the Royal Society of Canada in 1909. He was made a knight of the Order of St John of Jerusalem in England in 1912 and a knight of the Order of St Michael and St George on 31 December 1913.
From 1911 to his death, he was the Lieutenant Governor of Quebec.
His brother Charles Langelier was also an MP from 1887 to 1890.