Reid Laurence "Larry" LaLonde, also known as Ler LaLonde, is an American musician. He has been the guitarist for the rock band Primus since 1989, where he is known for his experimental accompaniment to the bass playing of bandmate Les Claypool. Previously, he played guitar for several groups including Possessed and Blind Illusion. He also has collaborated more recently with artists such as Serj Tankian and Tom Waits.

Possessed is an American death metal band, originally formed in 1983. Noted for their fast style of playing and Jeff Becerra's growled vocals, they are often called the first band in the death metal genre, and paved the way for the 1980s Bay Area thrash metal scene, along with Metallica, Exodus, Testament and Death Angel. The band is also notable for featuring future Primus member Larry LaLonde, who was the guitarist for Possessed from 1984 to 1987.