diff --git a/share/completions/setsid.fish b/share/completions/setsid.fish
new file mode 100644
index 000000000..a380787f4
--- /dev/null
+++ b/share/completions/setsid.fish
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+# setsid is a tool to run a program in a new session.
+# It is part of the util-linux package.
+# See: https://www.kernel.org/pub/linux/utils/util-linux
+
+complete -c setsid -x -d 'Command to run' -a '(__fish_complete_subcommand)'
+complete -c setsid -n '__fish_no_arguments' -l ctty -s c -d 'Set controlling terminal to current one'
+complete -c setsid -n '__fish_no_arguments' -l wait -s w -d 'Wait until program ends and return its exit value'
+complete -c setsid -n '__fish_no_arguments' -l version -s V -d 'Display version and exit'
+complete -c setsid -n '__fish_no_arguments' -l help -s h -d 'Display help and exit'