Giant cell tumor of tendon sheath (GCTTS) is a second most common tumor of the hand following the ganglion cyst. It presents a slowly growing subcutaneous nodule in the finger encapsulated by a collagenous capsule. GCTTS has benign course mostly with diagnosed as a localized form, but rare cases of malignant GCTTS have been reported. As incomplete excision increases recurrence rate and on recurrence the possibility of malignant transformation also increases. The average age of onset of GCTTS is middle-aged adults and the prevalent site is the volar surface of finger. An 85-year-old Korean female presented with skin colored hard nodule on dorsal surface of left 3rd DIP joint of finger, a slowly enlarging for several years. Histological examination showed a well encapsulated round lobule in the dermis with varied cellularity. The mass consisted of many mononuclear cells and spindle cells in fibrous stroma, and osteoclast-like giant cells and foamy macrophages were characteristic. There was no specific finding in the Von-Kossa stain and the level of serum uric acid was normal. The patient was diagnosed with GCTTS and referred to an orthopedic surgeon for an excision surgery. Herein, we report a rare case of GCTTS occurring in old age on dorsal surface of finger.