Self-reinforced polymer composites (SRPCs) are receiving increasing attention by the industry for lightweight applications. The polymers used for SRPCs today are derived from fossil resources. However, due to a limitation of resources, interest is growing regarding the use of new alternatives for petrochemically based polymers in form of bio-based ones. This demand has led to a significant growth of bioplastics in terms of technological developments. Due to their low mechanical performance and durability, their use is still limited. SRPCs combine high stiffness, high impact and high durability with impairing recyclability. In SRPCs the same polymer is used for the reinforcing and matrix phases. SRPCs can be manufactured by commingling two yarns with different melting temperatures. The use of commingled yarns allows the combination of a large variety of fibres and therefore a wide range of material properties. The commingled yarns are processed into a textile and consolidated afterwards. Only the low melting temperature polymer is molten during the consolidation process. The fibres with the high melting temperature remain intact and act as the reinforcing phase of the composite. The development of such self-reinforced polymer composites is shown. Finally an outlook on further development of reinforcing bio-based SRPCs is given.