Oregon Route 104S

Infobox_road
state=OR
type=OR
route=104S
length_mi=0.88
length_km=1.42
direction_a=West
starting_terminus=
direction_b=East
ending_terminus=
established=2002
previous_type=OR
previous_route=104
next_type=Interstate
next_route=105

Oregon Route 104S is a state highway in the northwestern part of the U.S. state of Oregon. It is a spur of Oregon Route 104, and connects OR 104 to U.S. Route 101 and U.S. Route 101 Business in Warrenton. The route is designated as the Fort Stevens Spur of the Fort Stevens Highway No. 104 (see Oregon highways and routes).

Together with the southern portion of OR 104, it is a former alignment of US 101.