Document and Entity Information	3 Months Ended
	Mar. 31, 2012	May 21, 2012	Dec. 31, 2011
Document And Entity Information
Entity Registrant Name	Northumberland Resources, Inc.
Entity Central Index Key	0001486597
Document Type	10-Q
Document Period End Date	Mar. 31, 2012
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Is Entity a Well-known Seasoned Issuer?	No
Is Entity a Voluntary Filer?	No
Is Entity's Reporting Status Current?	Yes
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		162,169,099
Preferred StockShares Outstanding	0		0
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2012