diff --git a/Crypto/include/Poco/Crypto/Cipher.h b/Crypto/include/Poco/Crypto/Cipher.h
index 7c7d37f4d..aba9bd7c4 100644
--- a/Crypto/include/Poco/Crypto/Cipher.h
+++ b/Crypto/include/Poco/Crypto/Cipher.h
@@ -107,7 +107,7 @@ public:
 		/// Returns the name of the Cipher.
 
 	virtual CryptoTransform* createEncryptor() = 0;
-		/// Creates an encrytor object to be used with a CryptoStream.
+		/// Creates an encryptor object to be used with a CryptoStream.
 
 	virtual CryptoTransform* createDecryptor() = 0;
 		/// Creates a decryptor object to be used with a CryptoStream.
diff --git a/Crypto/include/Poco/Crypto/CipherImpl.h b/Crypto/include/Poco/Crypto/CipherImpl.h
index 1a1f10b6e..c4abfdd56 100644
--- a/Crypto/include/Poco/Crypto/CipherImpl.h
+++ b/Crypto/include/Poco/Crypto/CipherImpl.h
@@ -45,10 +45,10 @@ public:
 		/// Returns the name of the cipher.
 
 	CryptoTransform* createEncryptor();
-		/// Creates an encrytor object.
+		/// Creates an encryptor object.
 
 	CryptoTransform* createDecryptor();
-		/// Creates a decrytor object.
+		/// Creates a decryptor object.
 
 private:
 	CipherKey _key;
diff --git a/Crypto/include/Poco/Crypto/RSACipherImpl.h b/Crypto/include/Poco/Crypto/RSACipherImpl.h
index cbcf22c98..bc24fd051 100644
--- a/Crypto/include/Poco/Crypto/RSACipherImpl.h
+++ b/Crypto/include/Poco/Crypto/RSACipherImpl.h
@@ -52,10 +52,10 @@ public:
 		/// Returns the name of the Cipher.
 	
 	CryptoTransform* createEncryptor();
-		/// Creates an encrytor object.
+		/// Creates an encryptor object.
 
 	CryptoTransform* createDecryptor();
-		/// Creates a decrytor object.
+		/// Creates a decryptor object.
 
 private:
 	RSAKey _key;
diff --git a/Data/include/Poco/Data/SQLChannel.h b/Data/include/Poco/Data/SQLChannel.h
index 58d8e9c14..a24d03aa1 100644
--- a/Data/include/Poco/Data/SQLChannel.h
+++ b/Data/include/Poco/Data/SQLChannel.h
@@ -104,7 +104,7 @@ public:
 		///                  Table must exist in the target database. To disable archiving,
 		///                  set this property to empty string.
 		///
-		///     * async:     Indicates asynchronous execution. When excuting asynchronously,
+		///     * async:     Indicates asynchronous execution. When executing asynchronously,
 		///                  messages are sent to the target using asynchronous execution.
 		///                  However, prior to the next message being processed and sent to
 		///                  the target, the previous operation must have been either completed 
diff --git a/Data/include/Poco/Data/SessionImpl.h b/Data/include/Poco/Data/SessionImpl.h
index 2e71291d8..5b201b3ee 100644
--- a/Data/include/Poco/Data/SessionImpl.h
+++ b/Data/include/Poco/Data/SessionImpl.h
@@ -170,7 +170,7 @@ public:
 protected:
 	void setConnectionString(const std::string& connectionString);
 		/// Sets the connection string. Should only be called on
-		/// disconnetced sessions. Throws InvalidAccessException when called on
+		/// disconnected sessions. Throws InvalidAccessException when called on
 		/// a connected session.
 
 private:
diff --git a/Data/include/Poco/Data/Statement.h b/Data/include/Poco/Data/Statement.h
index 3ec465292..d469041fb 100644
--- a/Data/include/Poco/Data/Statement.h
+++ b/Data/include/Poco/Data/Statement.h
@@ -50,7 +50,7 @@ class Data_API Statement
 	/// It does not contain code of its own.
 	/// Its main purpose is to forward calls to the concrete StatementImpl stored inside.
 	/// Statement execution can be synchronous or asynchronous.
-	/// Synchronous ececution is achieved through execute() call, while asynchronous is
+	/// Synchronous execution is achieved through execute() call, while asynchronous is
 	/// achieved through executeAsync() method call.
 	/// An asynchronously executing statement should not be copied during the execution. 
 	///
@@ -68,7 +68,7 @@ class Data_API Statement
 	///
 	/// See individual functions documentation for more details.
 	///
-	/// Statement owns the RowFormatter, which can be provided externaly through setFormatter()
+	/// Statement owns the RowFormatter, which can be provided externally through setFormatter()
 	/// member function.
 	/// If no formatter is externally supplied to the statement, the SimpleRowFormatter is lazy
 	/// created and used.
diff --git a/Data/include/Poco/Data/Transaction.h b/Data/include/Poco/Data/Transaction.h
index 31965953f..ddcb00130 100644
--- a/Data/include/Poco/Data/Transaction.h
+++ b/Data/include/Poco/Data/Transaction.h
@@ -36,7 +36,7 @@ class Data_API Transaction
 	/// transaction is in progress. If not, a new transaction is created.
 	/// When the Transaction is destroyed, and commit() has been called,
 	/// nothing is done. Otherwise, the current transaction is rolled back.
-	/// See Transaction for more detaisl nad purpose of this template.
+	/// See Transaction for more details and purpose of this template.
 {
 public:
 	Transaction(Poco::Data::Session& session, Poco::Logger* pLogger = 0);
diff --git a/Data/include/Poco/Data/TypeHandler.h b/Data/include/Poco/Data/TypeHandler.h
index bd3c5d510..06ad089ac 100644
--- a/Data/include/Poco/Data/TypeHandler.h
+++ b/Data/include/Poco/Data/TypeHandler.h
@@ -97,7 +97,7 @@ class TypeHandler: public AbstractTypeHandler
 	///	
 	///		static void extract(std::size_t pos, Person& obj, const Person& defVal, AbstractExtractor::Ptr pExt)
 	///		{
-	///			// defVal is the default person we should use if we encunter NULL entries, so we take the individual fields
+	///			// defVal is the default person we should use if we encounter NULL entries, so we take the individual fields
 	///			// as defaults. You can do more complex checking, ie return defVal if only one single entry of the fields is null etc...
 	///			poco_assert_dbg (!pExt.isNull());
 	///			std::string lastName;
diff --git a/Foundation/include/Poco/AbstractCache.h b/Foundation/include/Poco/AbstractCache.h
index ad9493bd7..873c3f3e7 100644
--- a/Foundation/include/Poco/AbstractCache.h
+++ b/Foundation/include/Poco/AbstractCache.h
@@ -87,7 +87,7 @@ public:
 		/// If for the key already an entry exists, it will be overwritten.
 		/// The difference to add is that no remove or add events are thrown in this case, 
 		/// just a simply silent update is performed
-		/// If the key doesnot exist the behavior is equal to add, ie. an add event is thrown
+		/// If the key does not exist the behavior is equal to add, ie. an add event is thrown
 	{
 		typename TMutex::ScopedLock lock(_mutex);
 		doUpdate(key, val);
@@ -107,7 +107,7 @@ public:
 		/// If for the key already an entry exists, it will be overwritten.
 		/// The difference to add is that no remove or add events are thrown in this case, 
 		/// just an Update is thrown
-		/// If the key doesnot exist the behavior is equal to add, ie. an add event is thrown
+		/// If the key does not exist the behavior is equal to add, ie. an add event is thrown
 	{
 		typename TMutex::ScopedLock lock(_mutex);
 		doUpdate(key, val);
diff --git a/Foundation/include/Poco/Any.h b/Foundation/include/Poco/Any.h
index 119a8b637..a90552873 100644
--- a/Foundation/include/Poco/Any.h
+++ b/Foundation/include/Poco/Any.h
@@ -516,7 +516,7 @@ ValueType AnyCast(Any& operand)
 	/// Example Usage: 
 	///	 MyType tmp = AnyCast<MyType>(anAny).
 	/// Will throw a BadCastException if the cast fails.
-	/// Dont use an AnyCast in combination with references, i.e. MyType& tmp = ... or const MyType& tmp = ...
+	/// Do not use an AnyCast in combination with references, i.e. MyType& tmp = ... or const MyType& tmp = ...
 	/// Some compilers will accept this code although a copy is returned. Use the RefAnyCast in
 	/// these cases.
 {
@@ -535,7 +535,7 @@ ValueType AnyCast(const Any& operand)
 	/// Example Usage: 
 	///	 MyType tmp = AnyCast<MyType>(anAny).
 	/// Will throw a BadCastException if the cast fails.
-	/// Dont use an AnyCast in combination with references, i.e. MyType& tmp = ... or const MyType& = ...
+	/// Do not use an AnyCast in combination with references, i.e. MyType& tmp = ... or const MyType& = ...
 	/// Some compilers will accept this code although a copy is returned. Use the RefAnyCast in
 	/// these cases.
 {
diff --git a/Foundation/include/Poco/FileChannel.h b/Foundation/include/Poco/FileChannel.h
index 374c622a3..a59fd23bf 100644
--- a/Foundation/include/Poco/FileChannel.h
+++ b/Foundation/include/Poco/FileChannel.h
@@ -152,7 +152,7 @@ class Foundation_API FileChannel: public Channel
 	//  or whether it's allowed to stay in the system's file buffer for some time. 
 	/// Valid values are:
 	///
-	///   * true:  Every essages is immediately flushed to the log file (default).
+	///   * true:  Every message is immediately flushed to the log file (default).
 	///   * false: Messages are not immediately flushed to the log file.
 	///
 	/// The rotateOnOpen property specifies whether an existing log file should be 
diff --git a/Foundation/include/Poco/SimpleFileChannel.h b/Foundation/include/Poco/SimpleFileChannel.h
index 4020329e1..784db0e8f 100644
--- a/Foundation/include/Poco/SimpleFileChannel.h
+++ b/Foundation/include/Poco/SimpleFileChannel.h
@@ -75,7 +75,7 @@ class Foundation_API SimpleFileChannel: public Channel
 	//  or whether it's allowed to stay in the system's file buffer for some time.
 	/// Valid values are:
 	///
-	///   * true:   Every essages is immediately flushed to the log file (default).
+	///   * true:   Every message is immediately flushed to the log file (default).
 	///   * false:  Messages are not immediately flushed to the log file.
 	///
 {
diff --git a/Foundation/include/Poco/ThreadPool.h b/Foundation/include/Poco/ThreadPool.h
index a176d67cf..954acabd2 100644
--- a/Foundation/include/Poco/ThreadPool.h
+++ b/Foundation/include/Poco/ThreadPool.h
@@ -42,7 +42,7 @@ class Foundation_API ThreadPool
 	/// Threads in a thread pool are re-used once they become
 	/// available again.
 	/// The thread pool always keeps a minimum number of threads
-	/// running. If the demans for threads increases, additional
+	/// running. If the demand for threads increases, additional
 	/// threads are created. Once the demand for threads sinks
 	/// again, no-longer used threads are stopped and removed
 	/// from the pool.
diff --git a/JSON/include/Poco/JSON/Template.h b/JSON/include/Poco/JSON/Template.h
index 63665e759..5118ea3f7 100644
--- a/JSON/include/Poco/JSON/Template.h
+++ b/JSON/include/Poco/JSON/Template.h
@@ -69,7 +69,7 @@ class JSON_API Template
 	///
 	///     <? ifexist query ?> <? else ?> <? endif ?>
 	/// ----
-	/// This can be used to check the existance of the value.
+	/// This can be used to check the existence of the value.
 	/// Use this for example when a zero value is ok (which returns false for <? if ?>.
 	/// 
 	///     <? for variable query ?> <? endfor ?>
diff --git a/Net/include/Poco/Net/NetworkInterface.h b/Net/include/Poco/Net/NetworkInterface.h
index d0f513567..fce7d3456 100644
--- a/Net/include/Poco/Net/NetworkInterface.h
+++ b/Net/include/Poco/Net/NetworkInterface.h
@@ -150,7 +150,7 @@ public:
 		/// Returns the interface adapter name.
 		///
 		/// On Windows platforms, this is the network adapter LUID.
-		/// The adapter name is used by some Windows Net APIs like Dhcp. 
+		/// The adapter name is used by some Windows Net APIs like DHCP. 
 		///
 		/// On other platforms this is the same as name().
 
@@ -183,7 +183,7 @@ public:
 		/// Returns the broadcast address for this network interface.
 
 	const IPAddress& destAddress(unsigned index = 0) const;
-		/// Returns the IPv4 point-to-point destiation address for this network interface.
+		/// Returns the IPv4 point-to-point destination address for this network interface.
 
 	const MACAddress& macAddress() const;
 		/// Returns MAC (Media Access Control) address for the interface.
diff --git a/Net/include/Poco/Net/RemoteSyslogChannel.h b/Net/include/Poco/Net/RemoteSyslogChannel.h
index 2efb325e8..46fe61db0 100644
--- a/Net/include/Poco/Net/RemoteSyslogChannel.h
+++ b/Net/include/Poco/Net/RemoteSyslogChannel.h
@@ -72,7 +72,7 @@ public:
 		SYSLOG_NTP      = (12<<3), /// ntp subsystem
 		SYSLOG_LOGAUDIT = (13<<3), /// log audit
 		SYSLOG_LOGALERT = (14<<3), /// log alert
-		SYSLOG_CLOCK    = (15<<3), /// clock deamon
+		SYSLOG_CLOCK    = (15<<3), /// clock daemon
 		SYSLOG_LOCAL0   = (16<<3), /// reserved for local use
 		SYSLOG_LOCAL1   = (17<<3), /// reserved for local use
 		SYSLOG_LOCAL2   = (18<<3), /// reserved for local use
diff --git a/PDF/include/Poco/PDF/Page.h b/PDF/include/Poco/PDF/Page.h
index 8797e8e5f..a59d4f27c 100644
--- a/PDF/include/Poco/PDF/Page.h
+++ b/PDF/include/Poco/PDF/Page.h
@@ -321,7 +321,7 @@ public:
 		/// Draws an arc.
 
 	void ellipse(float x, float y, float xRadius, float yRadius);
-		/// Draws an ellips.
+		/// Draws an ellipse.
 
 	void stroke();
 		/// Paints the current path.
diff --git a/XML/include/Poco/DOM/DOMObject.h b/XML/include/Poco/DOM/DOMObject.h
index a48e82d25..b2ecad16a 100644
--- a/XML/include/Poco/DOM/DOMObject.h
+++ b/XML/include/Poco/DOM/DOMObject.h
@@ -45,7 +45,7 @@ class XML_API DOMObject
 	/// For every call to duplicate() there must be a matching
 	/// call to release().
 	/// An object obtained via any other way must not be
-	/// released, except ownership of it has been explicitely
+	/// released, except ownership of it has been explicitly
 	/// taken with a call to duplicate().
 	///
 	/// While DOMObjects are safe for use in multithreaded programs,