| Honorific-Prefix: | The Honourable |
| Arthur Bliss Copp | |
| Assembly1: | New Brunswick Legislative |
| Constituency Am1: | Westmorland |
| Term Start1: | 1901 |
| Term End1: | 1912 |
| Office2: | Leader of the Opposition of the New Brunswick Legislative Assembly |
| Predecessor2: | Clifford William Robinson |
| Successor2: | Louis-Auguste Dugal |
| Term Start2: | 1912 |
| Term End2: | 1912 |
| Constituency Mp3: | Westmorland |
| Parliament3: | Canadian |
| Predecessor3: | Henry Emmerson |
| Successor3: | Otto Baird Price |
| Term Start3: | 1915 |
| Term End3: | 1925 |
| Office4: | Secretary of State of Canada |
| Primeminister4: | W. L. Mackenzie King |
| Term Start4: | December 29, 1921 |
| Term End4: | September 24, 1925 |
| Predecessor4: | Rodolphe Monty |
| Successor4: | Walter Edward Foster |
| Office5: | Senator for Westmorland, New Brunswick |
| Nominator5: | W. L. Mackenzie King |
| Appointed5: | The Viscount Byng of Vimy |
| Term Start5: | September 25, 1925 |
| Term End5: | December 5, 1949 |
| Birth Date: | July 10, 1870 |
| Birth Place: | Jolicure, New Brunswick, Canada |
| Nationality: | Canadian |
| Party: | Liberal Party of Canada |
| Otherparty: | Liberal Party of New Brunswick |
Arthur Bliss Copp (July 10, 1870 – December 5, 1949) was a Canadian politician.
Born in Jolicure, New Brunswick, to Joseph Harvey Copp and Frances Lydia Brennan. He was a lawyer before being elected to the Legislative Assembly of New Brunswick in a 1901 by-election; he represented Westmorland County until 1912. He was first elected to the House of Commons of Canada for the New Brunswick riding of Westmorland in a 1915 by-election. A Liberal, he was re-elected in 1917 and 1921. From 1921 to 1925, he was the Secretary of State of Canada. In 1925, he was called to the Senate of Canada representing the senatorial division of Westmorland, New Brunswick. He died in office in 1949. He is buried in the Sackville Rural Cemetery in Sackville, New Brunswick.
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