diff --git a/Library/Homebrew/cleanup.rb b/Library/Homebrew/cleanup.rb
index 19348c6a4cd60..66937919c49b5 100644
--- a/Library/Homebrew/cleanup.rb
+++ b/Library/Homebrew/cleanup.rb
@@ -130,7 +130,7 @@ def stale_formula?(pathname, scrub)
 
         formula = begin
           Formulary.from_rack(HOMEBREW_CELLAR/formula_name)
-        rescue FormulaUnavailableError, TapFormulaAmbiguityError, TapFormulaWithOldnameAmbiguityError
+        rescue FormulaUnavailableError, TapFormulaAmbiguityError
           nil
         end
 
@@ -300,7 +300,7 @@ def clean!(quiet: false, periodic: false)
         args.each do |arg|
           formula = begin
             Formulary.resolve(arg)
-          rescue FormulaUnavailableError, TapFormulaAmbiguityError, TapFormulaWithOldnameAmbiguityError
+          rescue FormulaUnavailableError, TapFormulaAmbiguityError
             nil
           end
 
diff --git a/Library/Homebrew/diagnostic.rb b/Library/Homebrew/diagnostic.rb
index 87d58992598f5..50ac367efa992 100644
--- a/Library/Homebrew/diagnostic.rb
+++ b/Library/Homebrew/diagnostic.rb
@@ -733,8 +733,7 @@ def check_for_unreadable_installed_formula
         rescue FormulaUnreadableError, FormulaClassUnavailableError,
                TapFormulaUnreadableError, TapFormulaClassUnavailableError => e
           formula_unavailable_exceptions << e
-        rescue FormulaUnavailableError,
-               TapFormulaAmbiguityError, TapFormulaWithOldnameAmbiguityError
+        rescue FormulaUnavailableError, TapFormulaAmbiguityError
           nil
         end
         return if formula_unavailable_exceptions.empty?
@@ -752,7 +751,7 @@ def check_for_unlinked_but_not_keg_only
           else
             begin
               Formulary.from_rack(rack).keg_only?
-            rescue FormulaUnavailableError, TapFormulaAmbiguityError, TapFormulaWithOldnameAmbiguityError
+            rescue FormulaUnavailableError, TapFormulaAmbiguityError
               false
             end
           end
diff --git a/Library/Homebrew/exceptions.rb b/Library/Homebrew/exceptions.rb
index 3fdda640b25c1..1094c7e517bf6 100644
--- a/Library/Homebrew/exceptions.rb
+++ b/Library/Homebrew/exceptions.rb
@@ -277,27 +277,6 @@ def initialize(name, loaders)
   end
 end
 
-# Raised when a formula's old name in a specific tap is found in multiple taps.
-class TapFormulaWithOldnameAmbiguityError < RuntimeError
-  attr_reader :name, :possible_tap_newname_formulae, :taps
-
-  def initialize(name, possible_tap_newname_formulae)
-    @name = name
-    @possible_tap_newname_formulae = possible_tap_newname_formulae
-
-    @taps = possible_tap_newname_formulae.map do |newname|
-      newname =~ HOMEBREW_TAP_FORMULA_REGEX
-      "#{Regexp.last_match(1)}/#{Regexp.last_match(2)}"
-    end
-
-    super <<~EOS
-      Formulae with '#{name}' old name found in multiple taps: #{taps.map { |t| "\n       * #{t}" }.join}
-
-      Please use the fully-qualified name (e.g. #{taps.first}/#{name}) to refer to the formula or use its new name.
-    EOS
-  end
-end
-
 # Raised when a tap is unavailable.
 class TapUnavailableError < RuntimeError
   attr_reader :name
diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 3b65c6248be60..9dd88c03650b0 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -1318,7 +1318,7 @@ def link_overwrite?(path)
         f = Formulary.factory(keg.name)
       rescue FormulaUnavailableError
         # formula for this keg is deleted, so defer to allowlist
-      rescue TapFormulaAmbiguityError, TapFormulaWithOldnameAmbiguityError
+      rescue TapFormulaAmbiguityError
         return false # this keg belongs to another formula
       else
         # this keg belongs to another unrelated formula
diff --git a/Library/Homebrew/formula_auditor.rb b/Library/Homebrew/formula_auditor.rb
index 2285785cc177e..93fdc1f0f386b 100644
--- a/Library/Homebrew/formula_auditor.rb
+++ b/Library/Homebrew/formula_auditor.rb
@@ -64,8 +64,7 @@ def audit_file
 
         unversioned_formula = begin
           Formulary.factory(full_name).path
-        rescue FormulaUnavailableError, TapFormulaAmbiguityError,
-               TapFormulaWithOldnameAmbiguityError
+        rescue FormulaUnavailableError, TapFormulaAmbiguityError
           Pathname.new formula.path.to_s.gsub(/@.*\.rb$/, ".rb")
         end
         unless unversioned_formula.exist?
@@ -285,9 +284,6 @@ def audit_deps
           rescue TapFormulaAmbiguityError
             problem "Ambiguous dependency '#{dep.name.inspect}'."
             next
-          rescue TapFormulaWithOldnameAmbiguityError
-            problem "Ambiguous oldname dependency '#{dep.name.inspect}'."
-            next
           end
 
           if dep_f.oldnames.include?(dep.name.split("/").last)
@@ -461,7 +457,7 @@ def audit_conflicts
         next
       rescue FormulaUnavailableError
         problem "Can't find conflicting formula #{conflict.name.inspect}."
-      rescue TapFormulaAmbiguityError, TapFormulaWithOldnameAmbiguityError
+      rescue TapFormulaAmbiguityError
         problem "Ambiguous conflicting formula #{conflict.name.inspect}."
       end
     end
diff --git a/Library/Homebrew/formulary.rb b/Library/Homebrew/formulary.rb
index 61019d9cfcca3..622f9ffb4e11f 100644
--- a/Library/Homebrew/formulary.rb
+++ b/Library/Homebrew/formulary.rb
@@ -990,7 +990,7 @@ def self.from_rack(
   # Return whether given rack is keg-only.
   def self.keg_only?(rack)
     Formulary.from_rack(rack).keg_only?
-  rescue FormulaUnavailableError, TapFormulaAmbiguityError, TapFormulaWithOldnameAmbiguityError
+  rescue FormulaUnavailableError, TapFormulaAmbiguityError
     false
   end