diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index caed0df9..f80494e0 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -28,3 +28,17 @@ repos:
       # - id: forbid-crlf
       - id: remove-crlf
         exclude: ".bat$"
+  - repo: local
+    hooks:
+      - id: dot-sh
+        name: Check .sh files against bash-it requirements
+        entry: ./hooks/dot-sh.sh
+        language: system
+        files: "\\.sh$"
+        types: [file]
+      - id: dot-bash
+        name: Check .bash files against bash-it requirements
+        entry: ./hooks/dot-bash.sh
+        language: system
+        files: "\\.bash$"
+        types: [file]
diff --git a/aliases/available/vim.aliases.bash b/aliases/available/vim.aliases.bash
index 72a37809..d19057d0 100644
--- a/aliases/available/vim.aliases.bash
+++ b/aliases/available/vim.aliases.bash
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 cite 'about-alias'
 about-alias 'vim abbreviations'
 
diff --git a/clean_files.txt b/clean_files.txt
index 2120e418..e02900c6 100644
--- a/clean_files.txt
+++ b/clean_files.txt
@@ -17,6 +17,7 @@
 # root directories
 #
 docs
+hooks
 
 # root files
 #
diff --git a/completion/available/cargo.completion.bash b/completion/available/cargo.completion.bash
index 46b399e4..d276ee72 100644
--- a/completion/available/cargo.completion.bash
+++ b/completion/available/cargo.completion.bash
@@ -1,5 +1,4 @@
-#!/usr/bin/env bash
-
+# shellcheck shell=bash
 # cargo (Rust package manager) completion
 
 if _binary_exists rustup && _binary_exists cargo; then
diff --git a/completion/available/knife.completion.bash b/completion/available/knife.completion.bash
index cf050e36..83b332f9 100644
--- a/completion/available/knife.completion.bash
+++ b/completion/available/knife.completion.bash
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+# shellcheck shell=bash
 
 # Published originally as public domain code at https://github.com/wk8/knife-bash-autocomplete
 
diff --git a/completion/available/packer.completion.bash b/completion/available/packer.completion.bash
index ea4b7b8c..2301f0f2 100644
--- a/completion/available/packer.completion.bash
+++ b/completion/available/packer.completion.bash
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+# shellcheck shell=bash
 cite "about-completion"
 about-completion "packer completion"
 
diff --git a/completion/available/pipx.completion.bash b/completion/available/pipx.completion.bash
index 9e34f076..16fd844d 100644
--- a/completion/available/pipx.completion.bash
+++ b/completion/available/pipx.completion.bash
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+# shellcheck shell=bash
 # pipx completion
 
 if _command_exists register-python-argcomplete && _command_exists pipx; then
diff --git a/completion/available/rustup.completion.bash b/completion/available/rustup.completion.bash
index 96822031..1cf8bc95 100644
--- a/completion/available/rustup.completion.bash
+++ b/completion/available/rustup.completion.bash
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+# shellcheck shell=bash
 
 # rustup (Rust toolchain installer) completion
 
diff --git a/completion/available/sdkman.completion.bash b/completion/available/sdkman.completion.bash
index 9888c031..16affe8d 100644
--- a/completion/available/sdkman.completion.bash
+++ b/completion/available/sdkman.completion.bash
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 _sdkman_complete() {
 	local CANDIDATES
 	local CANDIDATE_VERSIONS
diff --git a/completion/available/vault.completion.bash b/completion/available/vault.completion.bash
index 7d082ee7..9520f166 100644
--- a/completion/available/vault.completion.bash
+++ b/completion/available/vault.completion.bash
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+# shellcheck shell=bash
 cite "about-completion"
 about-completion "vault completion"
 
diff --git a/hooks/dot-bash.sh b/hooks/dot-bash.sh
new file mode 100755
index 00000000..7a9dc8bc
--- /dev/null
+++ b/hooks/dot-bash.sh
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+exit_code=0
+for file in "$@"; do
+	# Confirm file is not executable
+	#
+	if [[ -x "${file}" ]]; then
+		echo "Bash include file \`${file}\` should not be executable"
+		exit_code=1
+	fi
+
+	# Confirm expected schellcheck header
+	#
+	LINE1="$(head -n 1 "${file}")"
+	if [[ "${LINE1}" != "# shellcheck shell=bash" ]]; then
+		echo "Bash include file \`${file}\` has bad/missing shellcheck header"
+		exit_code=1
+	fi
+done
+
+exit $exit_code
diff --git a/hooks/dot-sh.sh b/hooks/dot-sh.sh
new file mode 100755
index 00000000..3fa63216
--- /dev/null
+++ b/hooks/dot-sh.sh
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+exit_code=0
+for file in "$@"; do
+	# Confirm file is executable
+	#
+	if [[ ! -x "${file}" ]]; then
+		echo "Bash file \`${file}\` is not executable"
+		exit_code=1
+	fi
+
+	# Confirm expected #! header
+	#
+	LINE1="$(head -n 1 "${file}")"
+	if [[ "${LINE1}" != "#!/usr/bin/env bash" ]]; then
+		echo "Bash file \`${file}\` has bad/missing #! header"
+		exit_code=1
+	fi
+done
+
+exit $exit_code
diff --git a/plugins/available/basher.plugin.bash b/plugins/available/basher.plugin.bash
index d226ffcb..2c77cbfa 100644
--- a/plugins/available/basher.plugin.bash
+++ b/plugins/available/basher.plugin.bash
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 cite about-plugin
 about-plugin 'initializes basher, the shell package manager'
 
diff --git a/themes/90210/90210.theme.bash b/themes/90210/90210.theme.bash
index 97c23f0e..180764c8 100644
--- a/themes/90210/90210.theme.bash
+++ b/themes/90210/90210.theme.bash
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+# shellcheck shell=bash
 SCM_THEME_PROMPT_DIRTY=" ${red}✗"
 SCM_THEME_PROMPT_CLEAN=" ${bold_green}✓"
 SCM_THEME_PROMPT_PREFIX=" |"
diff --git a/themes/agnoster/agnoster.theme.bash b/themes/agnoster/agnoster.theme.bash
index 1f3a5acb..ba3e2c9a 100644
--- a/themes/agnoster/agnoster.theme.bash
+++ b/themes/agnoster/agnoster.theme.bash
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+# shellcheck shell=bash
 # vim: ft=bash ts=2 sw=2 sts=2
 #
 # agnoster's Theme - https://gist.github.com/3712874
diff --git a/themes/barbuk/barbuk.theme.bash b/themes/barbuk/barbuk.theme.bash
index c7229997..8e09d4be 100644
--- a/themes/barbuk/barbuk.theme.bash
+++ b/themes/barbuk/barbuk.theme.bash
@@ -1,5 +1,4 @@
-#!/usr/bin/env bash
-# shellcheck disable=2034,2154
+# shellcheck shell=bash
 
 # Theme custom glyphs
 SCM_GIT_CHAR_GITLAB=${BARBUK_GITLAB_CHAR:='  '}
diff --git a/themes/powerline/powerline.base.bash b/themes/powerline/powerline.base.bash
index 38c5c895..dd39337e 100644
--- a/themes/powerline/powerline.base.bash
+++ b/themes/powerline/powerline.base.bash
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 # Define this here so it can be used by all of the Powerline themes
 THEME_CHECK_SUDO=${THEME_CHECK_SUDO:=true}
 
diff --git a/themes/powerline/powerline.theme.bash b/themes/powerline/powerline.theme.bash
index 83731614..3239b360 100644
--- a/themes/powerline/powerline.theme.bash
+++ b/themes/powerline/powerline.theme.bash
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+# shellcheck shell=bash
 
 # shellcheck source=../../themes/powerline/powerline.base.bash
 . "$BASH_IT/themes/powerline/powerline.base.bash"