Apparatus and methods are provided for locating an ostium of a body lumen. In one embodiment, a delivery catheter (10) or other tubular member includes a distal end sized for introduction into a body lumen, and one or more locator loops (50) on the distal end. In one embodiment, the locator loop may include first and second ends fixed to the distal end, first and second resilient struts extending from the first and second ends, respectively, and a curved intermediate region extending between the first and second struts. The loop may be resiliently compressible to a contracted condition for delivery and resiliently expandable to an enlarged condition when deployed. The apparatus may include one or more balloons, stents (40) , and the like on the distal end adjacent the locator loop.