diff --git a/cpp/ql/lib/semmle/code/cpp/dataflow/internal/DataFlowUtil.qll b/cpp/ql/lib/semmle/code/cpp/dataflow/internal/DataFlowUtil.qll
index da8e7564b3e..74ba3569d20 100644
--- a/cpp/ql/lib/semmle/code/cpp/dataflow/internal/DataFlowUtil.qll
+++ b/cpp/ql/lib/semmle/code/cpp/dataflow/internal/DataFlowUtil.qll
@@ -699,7 +699,7 @@ private predicate exprToExprStep_nocfg(Expr fromExpr, Expr toExpr) {
         call.getTarget() = f and
         // AST dataflow treats a reference as if it were the referred-to object, while the dataflow
         // models treat references as pointers. If the return type of the call is a reference, then
-        // look for data flow the the referred-to object, rather than the reference itself.
+        // look for data flow the referred-to object, rather than the reference itself.
         if call.getType().getUnspecifiedType() instanceof ReferenceType
         then outModel.isReturnValueDeref()
         else outModel.isReturnValue()
diff --git a/cpp/ql/lib/semmle/code/cpp/rangeanalysis/SimpleRangeAnalysis.qll b/cpp/ql/lib/semmle/code/cpp/rangeanalysis/SimpleRangeAnalysis.qll
index c9e790d9077..0f47770dc82 100644
--- a/cpp/ql/lib/semmle/code/cpp/rangeanalysis/SimpleRangeAnalysis.qll
+++ b/cpp/ql/lib/semmle/code/cpp/rangeanalysis/SimpleRangeAnalysis.qll
@@ -1573,7 +1573,7 @@ private module SimpleRangeAnalysisCached {
     result = min([max(getTruncatedUpperBounds(expr)), getGuardedUpperBound(expr)])
   }
 
-  /** Holds if the upper bound of `expr` may have been widened. This means the the upper bound is in practice likely to be overly wide. */
+  /** Holds if the upper bound of `expr` may have been widened. This means the upper bound is in practice likely to be overly wide. */
   cached
   predicate upperBoundMayBeWidened(Expr e) {
     isRecursiveExpr(e) and
diff --git a/csharp/ql/lib/semmle/code/csharp/controlflow/internal/ControlFlowGraphImpl.qll b/csharp/ql/lib/semmle/code/csharp/controlflow/internal/ControlFlowGraphImpl.qll
index d9bebb9bf17..b63d804216b 100644
--- a/csharp/ql/lib/semmle/code/csharp/controlflow/internal/ControlFlowGraphImpl.qll
+++ b/csharp/ql/lib/semmle/code/csharp/controlflow/internal/ControlFlowGraphImpl.qll
@@ -335,7 +335,7 @@ module Expressions {
       // ```csharp
       // new Dictionary<int, string>() { [0] = "Zero", [1] = "One", [2] = "Two" }
       // ```
-      // need special treatment, because the the accesses `[0]`, `[1]`, and `[2]`
+      // need special treatment, because the accesses `[0]`, `[1]`, and `[2]`
       // have no qualifier.
       this = any(MemberInitializer mi).getLValue()
     }
diff --git a/csharp/ql/src/Telemetry/ExternalApi.qll b/csharp/ql/src/Telemetry/ExternalApi.qll
index 9679cd1061a..685eda64e50 100644
--- a/csharp/ql/src/Telemetry/ExternalApi.qll
+++ b/csharp/ql/src/Telemetry/ExternalApi.qll
@@ -85,7 +85,7 @@ class ExternalApi extends DotNet::Callable {
     defaultAdditionalTaintStep(this.getAnInput(), _)
   }
 
-  /** Holds if this API is is a constructor without parameters. */
+  /** Holds if this API is a constructor without parameters. */
   private predicate isParameterlessConstructor() {
     this instanceof Constructor and this.getNumberOfParameters() = 0
   }
diff --git a/go/ql/src/RedundantCode/DuplicateSwitchCase.ql b/go/ql/src/RedundantCode/DuplicateSwitchCase.ql
index 46956347785..7af97b76875 100644
--- a/go/ql/src/RedundantCode/DuplicateSwitchCase.ql
+++ b/go/ql/src/RedundantCode/DuplicateSwitchCase.ql
@@ -13,7 +13,7 @@
 
 import go
 
-/** Gets the global value number of of `e`, which is the `i`th case label of `switch`. */
+/** Gets the global value number of `e`, which is the `i`th case label of `switch`. */
 GVN switchCaseGVN(SwitchStmt switch, int i, Expr e) {
   e = switch.getCase(i).getExpr(0) and result = e.getGlobalValueNumber()
 }
diff --git a/java/ql/src/Telemetry/ExternalApi.qll b/java/ql/src/Telemetry/ExternalApi.qll
index b839ca15c6d..eaf88555444 100644
--- a/java/ql/src/Telemetry/ExternalApi.qll
+++ b/java/ql/src/Telemetry/ExternalApi.qll
@@ -73,7 +73,7 @@ class ExternalApi extends Callable {
     TaintTracking::localAdditionalTaintStep(this.getAnInput(), _)
   }
 
-  /** Holds if this API is is a constructor without parameters. */
+  /** Holds if this API is a constructor without parameters. */
   private predicate isParameterlessConstructor() {
     this instanceof Constructor and this.getNumberOfParameters() = 0
   }
diff --git a/python/ql/lib/semmle/python/Frameworks.qll b/python/ql/lib/semmle/python/Frameworks.qll
index daa67ee4231..6cf4044157b 100644
--- a/python/ql/lib/semmle/python/Frameworks.qll
+++ b/python/ql/lib/semmle/python/Frameworks.qll
@@ -2,7 +2,7 @@
  * Helper file that imports all framework modeling.
  */
 
-// If you add modeling of a new framework/library, remember to add it it to the docs in
+// If you add modeling of a new framework/library, remember to add it to the docs in
 // `docs/codeql/support/reusables/frameworks.rst`
 private import semmle.python.frameworks.Aioch
 private import semmle.python.frameworks.Aiohttp
diff --git a/python/ql/lib/semmle/python/dataflow/old/TaintTracking.qll b/python/ql/lib/semmle/python/dataflow/old/TaintTracking.qll
index 22832b46c6c..d0293522404 100755
--- a/python/ql/lib/semmle/python/dataflow/old/TaintTracking.qll
+++ b/python/ql/lib/semmle/python/dataflow/old/TaintTracking.qll
@@ -333,7 +333,7 @@ abstract class Sanitizer extends string {
   /** Holds if `taint` cannot flow through `node`. */
   predicate sanitizingNode(TaintKind taint, ControlFlowNode node) { none() }
 
-  /** Holds if `call` removes removes the `taint` */
+  /** Holds if `call` removes the `taint` */
   predicate sanitizingCall(TaintKind taint, FunctionObject callee) { none() }
 
   /** Holds if `test` shows value to be untainted with `taint` */
diff --git a/ql/ql/src/codeql_ql/ast/internal/Module.qll b/ql/ql/src/codeql_ql/ast/internal/Module.qll
index 91a5888ac12..8c1e6189e0a 100644
--- a/ql/ql/src/codeql_ql/ast/internal/Module.qll
+++ b/ql/ql/src/codeql_ql/ast/internal/Module.qll
@@ -78,7 +78,7 @@ private class Folder_ extends ContainerOrModule, TFolder {
 
   override ContainerOrModule getEnclosing() {
     result = TFolder(f.getParentContainer()) and
-    // if this the the root, then we stop.
+    // if this the root, then we stop.
     not exists(f.getFile("qlpack.yml"))
   }
 
diff --git a/ql/ql/src/queries/performance/MissingNomagic.ql b/ql/ql/src/queries/performance/MissingNomagic.ql
index 13084bf6ad6..ebab0e7b7e5 100644
--- a/ql/ql/src/queries/performance/MissingNomagic.ql
+++ b/ql/ql/src/queries/performance/MissingNomagic.ql
@@ -57,7 +57,7 @@ class CandidatePredicate extends Predicate {
         this.getName()
             .regexpCapture("(.+)" + ["0", "helper", "aux", "cand", "Helper", "Aux", "Cand"], 1)
       or
-      // Or this this predicate is named "foo02" and `pred` is named "foo01".
+      // Or this predicate is named "foo02" and `pred` is named "foo01".
       exists(int n, string name |
         hasNameWithNumberSuffix(pred, name, n) and
         hasNameWithNumberSuffix(this, name, n - 1)
diff --git a/ruby/ql/lib/codeql/ruby/controlflow/CfgNodes.qll b/ruby/ql/lib/codeql/ruby/controlflow/CfgNodes.qll
index efb69af39eb..95a0514320e 100644
--- a/ruby/ql/lib/codeql/ruby/controlflow/CfgNodes.qll
+++ b/ruby/ql/lib/codeql/ruby/controlflow/CfgNodes.qll
@@ -348,7 +348,7 @@ module ExprNodes {
     /** Gets an argument of this call. */
     final ExprCfgNode getAnArgument() { result = this.getArgument(_) }
 
-    /** Gets the the keyword argument whose key is `keyword` of this call. */
+    /** Gets the keyword argument whose key is `keyword` of this call. */
     final ExprCfgNode getKeywordArgument(string keyword) {
       exists(PairCfgNode n |
         e.hasCfgChild(e.getAnArgument(), this, n) and
diff --git a/ruby/ql/lib/codeql/ruby/dataflow/internal/DataFlowPublic.qll b/ruby/ql/lib/codeql/ruby/dataflow/internal/DataFlowPublic.qll
index 730445d99ac..11aa33b7551 100644
--- a/ruby/ql/lib/codeql/ruby/dataflow/internal/DataFlowPublic.qll
+++ b/ruby/ql/lib/codeql/ruby/dataflow/internal/DataFlowPublic.qll
@@ -71,7 +71,7 @@ class CallNode extends LocalSourceNode, ExprNode {
   /** Gets the data-flow node corresponding to the named argument of the call corresponding to this data-flow node */
   ExprNode getKeywordArgument(string name) { result.getExprNode() = node.getKeywordArgument(name) }
 
-  /** Gets the name of the the method called by the method call (if any) corresponding to this data-flow node */
+  /** Gets the name of the method called by the method call (if any) corresponding to this data-flow node */
   string getMethodName() { result = node.getExpr().(MethodCall).getMethodName() }
 
   /** Gets the number of arguments of this call. */
diff --git a/ruby/ql/lib/codeql/ruby/frameworks/GraphQL.qll b/ruby/ql/lib/codeql/ruby/frameworks/GraphQL.qll
index 3dacd89b25e..ede99069213 100644
--- a/ruby/ql/lib/codeql/ruby/frameworks/GraphQL.qll
+++ b/ruby/ql/lib/codeql/ruby/frameworks/GraphQL.qll
@@ -379,7 +379,7 @@ class GraphqlFieldResolutionMethod extends Method, HTTP::Server::RequestHandler:
         result.(KeywordParameter).hasName(argDefn.getArgumentName())
         or
         // TODO this will cause false positives because now *anything* in the **args
-        // param will be flagged as as RoutedParameter/RemoteFlowSource, but really
+        // param will be flagged as RoutedParameter/RemoteFlowSource, but really
         // only the hash keys corresponding to the defined arguments are user input
         // others could be things defined in the `:extras` keyword argument to the `argument`
         result instanceof HashSplatParameter // often you see `def field(**args)`