What is the name of Andy's neighbor who tortures toys?

Andy’s neighbor who tortures toys is Sid Phillips.

Sid is Andy Davis’s next-door neighbor in the original Toy Story (1995). Unlike Andy, who treats his toys as friends and heroes, Sid enjoys experimenting on them, blowing them up, dismembering them, and combining their parts into grotesque creations. His bedroom becomes one of the film’s most unsettling locations.

Sid’s victims include a doll, a combat Carl toy, and other damaged toys. After Woody and Buzz end up in Sid’s possession, Woody reveals that toys are alive, allowing Sid’s mutilated toys to frighten him into abandoning his destructive hobby. Sid is later seen wearing a garbage-collector uniform, a small visual joke that connects him to the climactic rescue.

A common mix-up is confusing Sid with villains from later films. Lotso is the pink bear from Toy Story 3, Stinky Pete is the prospector in Toy Story 2, and Al McWhiggin is the toy collector who steals Woody. Sid is not a major franchise villain, but his brief role establishes the danger of being mistreated by a child.