Concrete is one of the construction materials which is usually used in infrastructure development. In this modern development era, there are many additional variations used for concrete such as additional fiber. The additional fiber used is HDPE plastic waste fiber (High-Density Polyethylene) due to reducing the accumulation of plastic waste which is very polluting the environment. Additional variations of HDPE plastic waste fibers are 0%, 2%, 4%, and 6% of the weight of coarse aggregate (gravel). Fiber is added to reduce HDPE plastic waste and reduce the weight of concrete. Testing of concrete compressive strength was carried out at 7 days and 28 days using cylindrical specimens with a total of 24 pieces of specimens. Based on the results of the compressive strength test, the concrete compressive strength of the HDPE plastic waste variation of 2% was obtained at 13.72 MPa at 28 days. In the concrete compressive strength, additional HDPE plastic waste fibers from variations of 0%, 2%, 4%, and 6% at 7 days of age decreased by 13%, 15%, and 34% and at 28 days decreased by 36%, 51%, and 50% of normal concrete compressive strength. Whereas for the weight of fiber concrete variations of 2%, 4%, and 6% decreased by 1.2%; 2.6%; and 3.6% of the weight of normal concrete.