Stalker

A stalker is someone who engages in stalking.

In media

Stalker (album), a 1995 dark ambient album by Lustmord & Robert Rich, inspired by the film
Stalker (CSI), an episode of the American television series CSI
Stalker (film), a 1979 film by Andrei Tarkovsky, based on the Russian novel Roadside Picnic
Stalker (novel), a novel partly based on the Russian novel Roadside Picnic
"Stalker", a song by Goldfinger from their album Disconnection Notice
"Stalker", a song by Aphrodite (artist) from their album "Aphrodite"
"Stalker", a song by Cascada from their album Original Me
Stalkers (comics), a 1990s comics limited series

S.T.A.L.K.E.R.: Shadow of Chernobyl, a first-person shooter based on Roadside Picnic
S.T.A.L.K.E.R.: Clear Sky, a prequel to S.T.A.L.K.E.R.: Shadow of Chernobyl
S.T.A.L.K.E.R.: Call of Pripyat, a sequel to S.T.A.L.K.E.R.: Shadow of Chernobyl
S.T.A.L.K.E.R. 2, another sequel to S.T.A.L.K.E.R.: Shadow of Chernobyl

John Stalker, a former Manchester Police Chief
The Stalker, ring name for professional wrestler Barry Windham
Stalker (G.I. Joe), a fictional character in the G.I. Joe universe
Stalker (Philip Reeve), armoured cyborgs in several of Philip Reeve's novels
Stalker (comics), a character from a short-lived DC 'sword & sorcery' comic
Stalker (Batman Beyond), a supervillain from the Batman Beyond Animated Series
Stalker (Gundam), a character from the anime series Mobile Fighter G Gundam