六硼化镧是一种无机化合物，化学式为LaB₆。它是一个超导体，相变温度只有0.45 K。

六硼化镧可由镧或氢化镧粉末和无定形硼粉在氢气中高温加热得到。

硼还原氧化镧也能得到六硼化镧：

2 La₂O₃ + 30 B → 4 LaB₆ + 3 B₂O₂↑

氧化镧也能被碳化硼还原：

La₂O₃ + 3 B₄C → 2 LaB₆ + 3 CO

硼还原氯化镧也能得到六硼化镧，这种方法不会引入碳、氧等杂质：

LaCl₃ + 7 B → LaB₆ + BCl₃

Lanthanum hexaboride (LaB₆, also called lanthanum boride and LaB) is an inorganic chemical, a boride of lanthanum. It is a refractory ceramic material that has a melting point of 2210 °C, and is insoluble in water and hydrochloric acid. It has a low work function and one of the highest electron emissivities known, and is stable in vacuum. Stoichiometric samples are colored intense purple-violet, while boron-rich ones (above LaB_6.07) are blue. Ion bombardment changes its color from purple to emerald green.