diff --git a/contrib/rpm/bitcoin.if b/contrib/rpm/bitcoin.if
index 2b096c2..b206866 100644
--- a/contrib/rpm/bitcoin.if
+++ b/contrib/rpm/bitcoin.if
@@ -121,7 +121,7 @@ interface(`bitcoin_manage_lib_dirs',`
 ########################################
 ## <summary>
 ##     All of the rules required to administrate
-##     an bitcoin environment
+##     a bitcoin environment
 ## </summary>
 ## <param name="domain">
 ##     <summary>
diff --git a/src/httpserver.h b/src/httpserver.h
index 6be9950..9df56e5 100644
--- a/src/httpserver.h
+++ b/src/httpserver.h
@@ -86,7 +86,7 @@ public:

     /**
      * Get the request header specified by hdr, or an empty string.
-     * Return an pair (isPresent,string).
+     * Return a pair (isPresent,string).
      */
     std::pair<bool, std::string> GetHeader(const std::string& hdr);

@@ -125,7 +125,7 @@ public:
     virtual ~HTTPClosure() {}
 };

-/** Event class. This can be used either as an cross-thread trigger or as a timer.
+/** Event class. This can be used either as a cross-thread trigger or as a timer.
  */
 class HTTPEvent
 {
diff --git a/src/rest.cpp b/src/rest.cpp
index 8fb0c13..33e3fb4 100644
--- a/src/rest.cpp
+++ b/src/rest.cpp
@@ -413,7 +413,7 @@ static bool rest_getutxos(HTTPRequest* req, const std::string& strURIPart)
         boost::split(uriParts, strUriParams, boost::is_any_of("/"));
     }

-    // throw exception in case of a empty request
+    // throw exception in case of an empty request
     std::string strRequestMutable = req->ReadBody();
     if (strRequestMutable.length() == 0 && uriParts.size() == 0)
         return RESTERR(req, HTTP_BAD_REQUEST, "Error: empty request");
diff --git a/src/test/data/script_tests.json b/src/test/data/script_tests.json
index e35a7ce..0390d68 100644
--- a/src/test/data/script_tests.json
+++ b/src/test/data/script_tests.json
@@ -2506,7 +2506,7 @@
 ],

 ["CHECKSEQUENCEVERIFY tests"],
-["", "CHECKSEQUENCEVERIFY", "CHECKSEQUENCEVERIFY", "INVALID_STACK_OPERATION", "CSV automatically fails on a empty stack"],
+["", "CHECKSEQUENCEVERIFY", "CHECKSEQUENCEVERIFY", "INVALID_STACK_OPERATION", "CSV automatically fails on an empty stack"],
 ["-1", "CHECKSEQUENCEVERIFY", "CHECKSEQUENCEVERIFY", "NEGATIVE_LOCKTIME", "CSV automatically fails if stack top is negative"],
 ["0x0100", "CHECKSEQUENCEVERIFY", "CHECKSEQUENCEVERIFY,MINIMALDATA", "UNKNOWN_ERROR", "CSV fails if stack top is not minimally encoded"],
 ["0", "CHECKSEQUENCEVERIFY", "CHECKSEQUENCEVERIFY", "UNSATISFIED_LOCKTIME", "CSV fails if stack top bit 1 << 31 is set and the tx version < 2"],
diff --git a/src/validation.cpp b/src/validation.cpp
index bef1733..7b40447 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -1206,7 +1206,7 @@ static bool CheckInputs(const CTransaction& tx, CValidationState &state, const C
                             return state.Invalid(false, REJECT_NONSTANDARD, strprintf("non-mandatory-script-verify-flag (%s)", ScriptErrorString(check.GetScriptError())));
                     }
                     // Failures of other flags indicate a transaction that is
-                    // invalid in new blocks, e.g. a invalid P2SH. We DoS ban
+                    // invalid in new blocks, e.g. an invalid P2SH. We DoS ban
                     // such nodes as they are not following the protocol. That
                     // said during an upgrade careful thought should be taken
                     // as to the correct behavior - we may want to continue
diff --git a/test/functional/rest.py b/test/functional/rest.py
index fbcceba..6e58090 100755
--- a/test/functional/rest.py
+++ b/test/functional/rest.py
@@ -82,9 +82,9 @@ class RESTTest (BitcoinTestFramework):
                 n = vout['n']


-        ######################################
-        # GETUTXOS: query a unspent outpoint #
-        ######################################
+        #######################################
+        # GETUTXOS: query an unspent outpoint #
+        #######################################
         json_request = '/checkmempool/'+txid+'-'+str(n)
         json_string = http_get_call(url.hostname, url.port, '/rest/getutxos'+json_request+self.FORMAT_SEPARATOR+'json')
         json_obj = json.loads(json_string)
@@ -97,9 +97,9 @@ class RESTTest (BitcoinTestFramework):
         assert_equal(json_obj['utxos'][0]['value'], 0.1)


-        ################################################
-        # GETUTXOS: now query a already spent outpoint #
-        ################################################
+        #################################################
+        # GETUTXOS: now query an already spent outpoint #
+        #################################################
         json_request = '/checkmempool/'+vintx+'-0'
         json_string = http_get_call(url.hostname, url.port, '/rest/getutxos'+json_request+self.FORMAT_SEPARATOR+'json')
         json_obj = json.loads(json_string)
@@ -171,14 +171,14 @@ class RESTTest (BitcoinTestFramework):
         #do some invalid requests
         json_request = '{"checkmempool'
         response = http_post_call(url.hostname, url.port, '/rest/getutxos'+self.FORMAT_SEPARATOR+'json', json_request, True)
-        assert_equal(response.status, 400) #must be a 400 because we send a invalid json request
+        assert_equal(response.status, 400) #must be a 400 because we send an invalid json request

         json_request = '{"checkmempool'
         response = http_post_call(url.hostname, url.port, '/rest/getutxos'+self.FORMAT_SEPARATOR+'bin', json_request, True)
-        assert_equal(response.status, 400) #must be a 400 because we send a invalid bin request
+        assert_equal(response.status, 400) #must be a 400 because we send an invalid bin request

         response = http_post_call(url.hostname, url.port, '/rest/getutxos/checkmempool'+self.FORMAT_SEPARATOR+'bin', '', True)
-        assert_equal(response.status, 400) #must be a 400 because we send a invalid bin request
+        assert_equal(response.status, 400) #must be a 400 because we send an invalid bin request

         #test limits
         json_request = '/checkmempool/'