This study was a field experiment conducted in the summer to evaluate the effects of Liquid Organic Fertilizer (LOF) derived from oil palm sap on the growth of robusta coffee seedlings as an alternative to chemical fertilizers. The experiment was designed using a single-factor Randomized Block Design (RBD) with five treatments, including, plant height, number of leaves, leaf width, stem diameter and root volume. Observations were conducted from 3 weeks to 9 weeks after planting. The results showed that the administration of oil palm sap (LOF) at a dose of 80 mL/L (M4) had significant positive impact on the growth of robusta coffee seedlings. The average plant height was recorded at 25.46 cm, the number of leaves at 10.50, the average leaf width at 5.44 cm, the stem diameter at 4.42 cm and the root volume at 6.2 mm. This study is the first to examine the use of oil palm sap LOF on robusta coffee seedlings and has shown substantial results with doses ranging from 20-80 mL/polybag. This study highlights the potential of using sustainable organic fertilizers, such as oil palm sap LOF, to support the growth of robusta coffee plants.