|Member of the New Brunswick House of Assembly for Victoria|
|Member of Parliament for Victoria|
|Preceded by||first member|
|Succeeded by||Pius Michaud|
|Senator for New Brunswick|
January 15, 1907 – September 29, 1916
|Born||February 1, 1835|
Saint-Nicolas, Lower Canada
|Died|| September 29, 1916 81) (aged|
Ottawa, Ontario, Canada
|Political party||Liberal-Conservative → Liberal|
|Residence||Victoria County, New Brunswick|
|Occupation||physiotherapist, health care administrator|
Costigan was born on February 1, 1835, in Saint-Nicolas, Lower Canada, the son of Irish immigrants John Costigan and Bridget Dunn. He was educated at Collège de Sainte-Anne-de-la-Pocatière in Lower Canada from 1850 to 1852. In 1857, he became registrar of deeds and wills for Victoria County in New Brunswick and a judge of the Inferior Court of Common Pleas. He resigned from these posts in 1861 when he was elected to be a member of the 19th New Brunswick Legislative Assembly, representing the electoral district of Victoria.
On September 20, 1867, he was elected to the 1st Canadian Parliament as a member of the Liberal-Conservative Party by the riding of Victoria in New Brunswick. He was re-elected nine times, and he became a member of the Liberal Party on February 6, 1906. During his time as a Member of Parliament, he was a Minister of Inland Revenue, a Secretary of State of Canada, a Minister of Marine and Fisheries, and an acting Minister of Trade and Commerce. He was Dean of the House from 1896 to 1907.
On January 15, 1907, he was appointed a member of the Senate of Canada for the senatorial division of Victoria, New Brunswick. He died in office on September 29, 1916, in Ottawa. He was interred in Grand Falls.
- Shanahan (2000).
- The elections for the 19th New Brunswick Legislative Assembly took place in 1861, but Costigan did not take his seat until the Assembly's first sitting on February 12, 1862.
- Shanahan, David (2000). "Costigan, John". Dictionary of Canadian Biography Online. Retrieved October 13, 2011.