Guy III, Count of Saint-Pol

{{Infobox noble

| name = Guy III

| title = Count of Saint-Pol

| image = Blason maison fr de Châtillon-Saint-Pol.svg

| image_size = 150px

| caption = Coat of arms of the Counts of Blois-Châtillon

| noble family = Châtillon

| father = Hugh I, Count of Blois

| mother = Mary, Countess of Blois

| spouse = {{marriage|Matilda of Brabant, Countess of Artois|1255|1288|end=d}}

| issue = {{plainlist|

• Hugh II
• Guy IV
• Jacques
• Beatrix
• Jeanne

}}

| birth_date =

| birth_place =

| death_date = 1289

| death_place =

}}

Guy III of Châtillon, Count of Saint-Pol (died 1289) was a French nobleman, and was a younger son of Hugh I, Count of Blois, and Mary, Countess of Blois.Theodore Evergates, The Aristocracy in the County of Champagne, 1100-1300, (University of Pennsylvania Press, 2007), 254.

While his elder brother John I of Châtillon succeeded to their mother's County of Blois, Guy was given their father's county of Saint-Pol-sur-Ternoise at his death in 1248.

On January 16, 1255, he married Matilda of Brabant, Countess of Artois,"Maude of Brabant (1224–1288)." Women in World History: A Biographical Encyclopedia. 2002. {{Cite web |url=https://www.highbeam.com/doc/1G2-2591306344.html |title=Maude of Brabant (1224–1288) |access-date=2020-01-05 |archive-date=2016-03-08 |archive-url=https://web.archive.org/web/20160308205352/https://www.highbeam.com/doc/1G2-2591306344.html |url-status=dead }} daughter of Henry II, Duke of Brabant and Marie of Hohenstaufen, and thereafter was a supporter of his brother-in-law Henry III against Guelders. They had:

• Hugh II, Count of Blois.M. A. Pollock, Scotland, England and France After the Loss of Normandy, 1204-1296, (The Boydell Press, 2015), 184.
• Guy IV, Count of Saint-Pol.
• Jacques, lord of Leuze-Châtillon.
• Beatrix (d. 1304), married John I of Brienne, Count of Eu
• Jeanne, married Guillaume III de Chauvigny, Lord of Châteauroux

He joined the Eighth Crusade (1270) and the ill-fated Crusade of Aragón of Philip III of France.