Document And Entity Information	6 Months Ended
	Jun. 30, 2012	Aug. 14, 2012
Entity Registrant Name	REGENERX BIOPHARMACEUTICALS INC
Entity Central Index Key	0000707511
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Trading Symbol	RGRX
Entity Common Stock, Shares Outstanding		81,733,247
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2012
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2012