diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5c2e4be25..ae361417b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -81,6 +81,7 @@
   - `aws`
   - `bat` (#6052)
   - `bosh` (#5700)
+  - `btrfs`
   - `camcontrol`
   - `cf` (#5700)
   - `code` (#6205)
diff --git a/share/completions/btrfs.fish b/share/completions/btrfs.fish
new file mode 100644
index 000000000..5cf2c45bf
--- /dev/null
+++ b/share/completions/btrfs.fish
@@ -0,0 +1,134 @@
+# Completions for btrfs-progs
+# Author: Akatsuki (akiirui) <imaykiller@gmail.com>
+
+# Todo:
+# 1. Detailed options per command
+# 2. Simplified descriptions
+# ...and more
+
+# Filter the completions per command groups
+function __btrfs_options_groups
+    if not set -q argv[1]
+        return 1
+    end
+    set -l cmd (commandline -cp)
+    if string match -qr -- "$argv\s+\S*\$" $cmd
+        return 0
+    end
+    return 1
+end
+
+# Primary command
+complete -f -c btrfs -n '__fish_is_first_arg' -a check -d 'Check structural integrity of a filesystem (unmounted).'
+complete -f -c btrfs -n '__fish_is_first_arg' -a restore -d 'Try to restore files from a damaged filesystem (unmounted)'
+complete -f -c btrfs -n '__fish_is_first_arg' -a send -d 'Send the subvolume(s) to stdout.'
+complete -f -c btrfs -n '__fish_is_first_arg' -a receive -d 'Receive subvolumes from a stream'
+complete -f -c btrfs -n '__fish_is_first_arg' -a help -d 'Display help information'
+complete -f -c btrfs -n '__fish_is_first_arg' -a version -d 'Display btrfs-progs version'
+
+# Primary command groups
+complete -f -c btrfs -n '__fish_is_first_arg' -a subvolume -d 'manage subvolumes: create, delete, list, etc'
+complete -f -c btrfs -n '__fish_is_first_arg' -a filesystem -d 'overall filesystem tasks and information'
+complete -f -c btrfs -n '__fish_is_first_arg' -a balance -d 'balance data across devices, or change block groups using filters'
+complete -f -c btrfs -n '__fish_is_first_arg' -a device -d 'manage and query devices in the filesystem'
+complete -f -c btrfs -n '__fish_is_first_arg' -a scrub -d 'verify checksums of data and metadata'
+complete -f -c btrfs -n '__fish_is_first_arg' -a rescue -d 'toolbox for specific rescue operations'
+complete -f -c btrfs -n '__fish_is_first_arg' -a inspect-internal -d 'query various internal information'
+complete -f -c btrfs -n '__fish_is_first_arg' -a property -d 'modify properties of filesystem objects'
+complete -f -c btrfs -n '__fish_is_first_arg' -a quota -d 'manage filesystem quota settings'
+complete -f -c btrfs -n '__fish_is_first_arg' -a qgroup -d 'manage quota groups'
+complete -f -c btrfs -n '__fish_is_first_arg' -a replace -d 'replace a device in the filesystem'
+
+set -l subvolume '__btrfs_options_groups subvolume'
+set -l filesystem '__btrfs_options_groups filesystem'
+set -l balance '__btrfs_options_groups balance'
+set -l device '__btrfs_options_groups device'
+set -l scrub '__btrfs_options_groups scrub'
+set -l rescue '__btrfs_options_groups rescue'
+set -l inspect_internal "__btrfs_options_groups inspect-internal"
+set -l property '__btrfs_options_groups property'
+set -l quota '__btrfs_options_groups quota'
+set -l qgroup '__btrfs_options_groups qgroup'
+set -l replace '__btrfs_options_groups replace'
+
+# btrfs subvolume
+complete -f -c btrfs -n $subvolume -a create -d 'Create a subvolume'
+complete -f -c btrfs -n $subvolume -a delete -d 'Delete subvolume(s)'
+complete -f -c btrfs -n $subvolume -a list -d 'List subvolumes and snapshots in the filesystem.'
+complete -f -c btrfs -n $subvolume -a snapshot -d 'Create a snapshot of the subvolume'
+complete -f -c btrfs -n $subvolume -a get-default -d 'Get the default subvolume of a filesystem'
+complete -f -c btrfs -n $subvolume -a set-default -d 'Set the default subvolume of the filesystem mounted as default.'
+complete -f -c btrfs -n $subvolume -a find-new -d 'List the recently modified files in a filesystem'
+complete -f -c btrfs -n $subvolume -a show -d 'Show more information about the subvolume (UUIDs, generations, times, snapshots)'
+complete -f -c btrfs -n $subvolume -a sync -d 'Wait until given subvolume(s) are completely removed from the filesystem.'
+
+# btrfs filesystem
+complete -f -c btrfs -n $filesystem -a df -d 'Show space usage information for a mount point'
+complete -f -c btrfs -n $filesystem -a du -d 'Summarize disk usage of each file.'
+complete -f -c btrfs -n $filesystem -a show -d 'Show the structure of a filesystem'
+complete -f -c btrfs -n $filesystem -a sync -d 'Force a sync on a filesystem'
+complete -f -c btrfs -n $filesystem -a defragment -d 'Defragment a file or a directory'
+complete -f -c btrfs -n $filesystem -a resize -d 'Resize a filesystem'
+complete -f -c btrfs -n $filesystem -a label -d 'Get or change the label of a filesystem'
+complete -f -c btrfs -n $filesystem -a usage -d 'Show detailed information about internal filesystem usage.'
+
+# btrfs balance
+complete -f -c btrfs -n $balance -a start -d 'Balance chunks across the devices'
+complete -f -c btrfs -n $balance -a pause -d 'Pause running balance'
+complete -f -c btrfs -n $balance -a cancel -d 'Cancel running or paused balance'
+complete -f -c btrfs -n $balance -a resume -d 'Resume interrupted balance'
+complete -f -c btrfs -n $balance -a status -d 'Show status of running or paused balance'
+
+# btrfs device
+complete -f -c btrfs -n $device -a add -d 'Add one or more devices to a mounted filesystem.'
+complete -f -c btrfs -n $device -a delete -d 'Remove a device from a filesystem'
+complete -f -c btrfs -n $device -a remove -d 'Remove a device from a filesystem'
+complete -f -c btrfs -n $device -a scan -d 'Scan or forget (unregister) devices of btrfs filesystems'
+complete -f -c btrfs -n $device -a ready -d 'Check and wait until a group of devices of a filesystem is ready for mount'
+complete -f -c btrfs -n $device -a stats -d 'Show device IO error statistics'
+complete -f -c btrfs -n $device -a usage -d 'Show detailed information about internal allocations in devices.'
+
+# btrfs scrub
+complete -f -c btrfs -n $scrub -a start -d 'Start a new scrub. If a scrub is already running, the new one fails.'
+complete -f -c btrfs -n $scrub -a cancel -d 'Cancel a running scrub'
+complete -f -c btrfs -n $scrub -a resume -d 'Resume previously canceled or interrupted scrub'
+complete -f -c btrfs -n $scrub -a status -d 'Show status of running or finished scrub'
+
+# btrfs rescue
+complete -f -c btrfs -n $rescue -a chunk-recover -d 'Recover the chunk tree by scanning the devices one by one.'
+complete -f -c btrfs -n $rescue -a super-recover -d 'Recover bad superblocks from good copies'
+complete -f -c btrfs -n $rescue -a zero-log -d 'Clear the tree log. Usable if it\'s corrupted and prevents mount.'
+complete -f -c btrfs -n $rescue -a fix-device-size -d 'Re-align device and super block sizes. Usable if newer kernel refuse to mount it due to mismatch super size'
+
+# btrfs inspect-internal
+complete -f -c btrfs -n $inspect_internal -a inode-resolve -d 'Get file system paths for the given inode'
+complete -f -c btrfs -n $inspect_internal -a logical-resolve -d 'Get file system paths for the given logical address'
+complete -f -c btrfs -n $inspect_internal -a subvolid-resolve -d 'Get file system paths for the given subvolume ID.'
+complete -f -c btrfs -n $inspect_internal -a rootid -d 'Get tree ID of the containing subvolume of path.'
+complete -f -c btrfs -n $inspect_internal -a min-dev-size -d 'Get the minimum size the device can be shrunk to. The device id 1 is used by default.'
+complete -f -c btrfs -n $inspect_internal -a dump-tree -d 'Dump tree structures from a given device'
+complete -f -c btrfs -n $inspect_internal -a dump-super -d 'Dump superblock from a device in a textual form'
+complete -f -c btrfs -n $inspect_internal -a tree-stats -d 'Print various stats for trees'
+
+# btrfs property
+complete -f -c btrfs -n $property -a get -d 'Get a property value of a btrfs object'
+complete -f -c btrfs -n $property -a set -d 'Set a property on a btrfs object'
+complete -f -c btrfs -n $property -a list -d 'Lists available properties with their descriptions for the given object'
+
+# btrfs quota
+complete -f -c btrfs -n $quota -a enable -d 'Enable subvolume quota support for a filesystem.'
+complete -f -c btrfs -n $quota -a disable -d 'Disable subvolume quota support for a filesystem.'
+complete -f -c btrfs -n $quota -a rescan -d 'Trash all qgroup numbers and scan the metadata again with the current config.'
+
+# btrfs qgroup
+complete -f -c btrfs -n $qgroup -a assign -d 'Assign SRC as the child qgroup of DST'
+complete -f -c btrfs -n $qgroup -a remove -d 'Remove a child qgroup SRC from DST.'
+complete -f -c btrfs -n $qgroup -a create -d 'Create a subvolume quota group.'
+complete -f -c btrfs -n $qgroup -a destroy -d 'Destroy a quota group.'
+complete -f -c btrfs -n $qgroup -a show -d 'Show subvolume quota groups.'
+complete -f -c btrfs -n $qgroup -a limit -d 'Set the limits a subvolume quota group.'
+
+# btrfs replace
+complete -f -c btrfs -n $replace -a start -d 'Replace device of a btrfs filesystem.'
+complete -f -c btrfs -n $replace -a status -d 'Print status and progress information of a running device replace'
+complete -f -c btrfs -n $replace -a cancel -d 'Cancel a running device replace operation.'