端羟基聚丁二烯（Hydroxyl-terminated polybutadiene (HTPB)）是一种丁二烯聚合物，两端各有一个羟基官能团。属于多羟基聚合物类。用于和二异氰酸酯反应生成一种易于储存的人造物质聚氨酯。

HTPB是一种半透明液体，颜色与蜡纸近似，有极强的粘性。其性质不确定，因为HTPB制造级别不同以满足不同需求。HTPB是一类化合物的总称。在火箭学中，它作为一种高能燃料被称作RBS。但不易点燃，温度需超过773K才能燃烧。在烟火产业，它也作为礼花弹的炮管。它不溶于水，可做良好密封剂。HTPB的固化剂通常是甲苯二异氰酸酯或其他异氰酸酯类化合物。

Hydroxyl-terminated polybutadiene (HTPB) is an oligomer of butadiene terminated at each end with a hydroxyl functional group. It reacts with isocyanates to form polyurethane polymers.

HTPB is a translucent liquid with a color similar to wax paper and a viscosity similar to corn syrup. The properties vary because HTPB is a mixture rather than a pure compound, and it is manufactured to meet customers' specific requirements. A typical HTPB is R-45HTLO. This product consists of oligomeric units typically containing 40–50 butadiene molecules bonded together, with each end of the chain terminated with a hydroxyl [OH] group: