diff --git a/contrib/linearize/example-linearize.cfg b/contrib/linearize/example-linearize.cfg
index cccdd7921..69f0e9247 100644
--- a/contrib/linearize/example-linearize.cfg
+++ b/contrib/linearize/example-linearize.cfg
@@ -24,7 +24,7 @@ input=/home/example/.bitcoin/blocks
 output_file=/home/example/Downloads/bootstrap.dat
 hashlist=hashlist.txt
 
-# Maxmimum size in bytes of out-of-order blocks cache in memory
+# Maximum size in bytes of out-of-order blocks cache in memory
 out_of_order_cache_sz = 100000000
 
 # Do we want the reverse the hash bytes coming from getblockhash?
diff --git a/src/addrman.cpp b/src/addrman.cpp
index 662e931d2..ab84bf8e3 100644
--- a/src/addrman.cpp
+++ b/src/addrman.cpp
@@ -255,7 +255,7 @@ bool CAddrMan::Add_(const CAddress& addr, const CNetAddr& source, int64_t nTimeP
     int nId;
     CAddrInfo* pinfo = Find(addr, &nId);
 
-    // Do not set a penality for a source's self-announcement
+    // Do not set a penalty for a source's self-announcement
     if (addr == source) {
         nTimePenalty = 0;
     }
diff --git a/src/base58.h b/src/base58.h
index cccebc9e0..3998283bb 100644
--- a/src/base58.h
+++ b/src/base58.h
@@ -147,7 +147,7 @@ public:
     K GetKey() {
         K ret;
         if (vchData.size() == Size) {
-            //if base58 encouded data not holds a ext key, return a !IsValid() key
+            // If base58 encoded data does not hold an ext key, return a !IsValid() key
             ret.Decode(&vchData[0]);
         }
         return ret;
diff --git a/src/bench/perf.cpp b/src/bench/perf.cpp
index 1f43e5d3a..a549ec29e 100644
--- a/src/bench/perf.cpp
+++ b/src/bench/perf.cpp
@@ -6,7 +6,7 @@
 
 #if defined(__i386__) || defined(__x86_64__)
 
-/* These architectures support quering the cycle counter
+/* These architectures support querying the cycle counter
  * from user space, no need for any syscall overhead.
  */
 void perf_init(void) { }
diff --git a/src/blockencodings.h b/src/blockencodings.h
index 281db9fe0..5a1d80d42 100644
--- a/src/blockencodings.h
+++ b/src/blockencodings.h
@@ -99,7 +99,7 @@ public:
     }
 };
 
-// Dumb serialization/storage-helper for CBlockHeaderAndShortTxIDs and PartiallyDownlaodedBlock
+// Dumb serialization/storage-helper for CBlockHeaderAndShortTxIDs and PartiallyDownloadedBlock
 struct PrefilledTransaction {
     // Used as an offset since last prefilled tx in CBlockHeaderAndShortTxIDs,
     // as a proper transaction-in-block-index in PartiallyDownloadedBlock
diff --git a/src/consensus/params.h b/src/consensus/params.h
index 3f98938f7..6240e8285 100644
--- a/src/consensus/params.h
+++ b/src/consensus/params.h
@@ -47,7 +47,7 @@ struct Params {
     /** Block height at which BIP66 becomes active */
     int BIP66Height;
     /**
-     * Minimum blocks including miner confirmation of the total of 2016 blocks in a retargetting period,
+     * Minimum blocks including miner confirmation of the total of 2016 blocks in a retargeting period,
      * (nPowTargetTimespan / nPowTargetSpacing) which is also used for BIP9 deployments.
      * Examples: 1916 for 95%, 1512 for testchains.
      */
diff --git a/src/cuckoocache.h b/src/cuckoocache.h
index efd6a820b..ff47e9776 100644
--- a/src/cuckoocache.h
+++ b/src/cuckoocache.h
@@ -257,7 +257,7 @@ private:
      *
      * First, epoch_check decrements and checks the cheap heuristic, and then does
      * a more expensive scan if the cheap heuristic runs out. If the expensive
-     * scan suceeds, the epochs are aged and old elements are allow_erased. The
+     * scan succeeds, the epochs are aged and old elements are allow_erased. The
      * cheap heuristic is reset to retrigger after the worst case growth of the
      * current epoch's elements would exceed the epoch_size.
      */
@@ -395,7 +395,7 @@ public:
             * 1) On first iteration, last_loc == invalid(), find returns last, so
             *    last_loc defaults to locs[0].
             * 2) On further iterations, where last_loc == locs[k], last_loc will
-            *    go to locs[k+1 % 8], i.e., next of the 8 indicies wrapping around
+            *    go to locs[k+1 % 8], i.e., next of the 8 indices wrapping around
             *    to 0 if needed.
             *
             * This prevents moving the element we just put in.
diff --git a/src/httprpc.cpp b/src/httprpc.cpp
index 93beda09a..daac7a0f1 100644
--- a/src/httprpc.cpp
+++ b/src/httprpc.cpp
@@ -25,7 +25,7 @@
 static const char* WWW_AUTH_HEADER_DATA = "Basic realm=\"jsonrpc\"";
 
 /** Simple one-shot callback timer to be used by the RPC mechanism to e.g.
- * re-lock the wellet.
+ * re-lock the wallet.
  */
 class HTTPRPCTimer : public RPCTimerBase
 {
diff --git a/src/init.cpp b/src/init.cpp
index 5be011f94..e936e068f 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -1553,7 +1553,7 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
     }
 
     if (chainparams.GetConsensus().vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout != 0) {
-        // Only advertize witness capabilities if they have a reasonable start time.
+        // Only advertise witness capabilities if they have a reasonable start time.
         // This allows us to have the code merged without a defined softfork, by setting its
         // end time to 0.
         // Note that setting NODE_WITNESS is never required: the only downside from not
diff --git a/src/netaddress.h b/src/netaddress.h
index bc430dd82..a85c2b745 100644
--- a/src/netaddress.h
+++ b/src/netaddress.h
@@ -49,7 +49,7 @@ class CNetAddr
         bool IsIPv4() const;    // IPv4 mapped address (::FFFF:0:0/96, 0.0.0.0/0)
         bool IsIPv6() const;    // IPv6 address (not mapped IPv4, not Tor)
         bool IsRFC1918() const; // IPv4 private networks (10.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12)
-        bool IsRFC2544() const; // IPv4 inter-network communcations (192.18.0.0/15)
+        bool IsRFC2544() const; // IPv4 inter-network communications (192.18.0.0/15)
         bool IsRFC6598() const; // IPv4 ISP-level NAT (100.64.0.0/10)
         bool IsRFC5737() const; // IPv4 documentation addresses (192.0.2.0/24, 198.51.100.0/24, 203.0.113.0/24)
         bool IsRFC3849() const; // IPv6 documentation address (2001:0DB8::/32)
diff --git a/src/qt/bantablemodel.cpp b/src/qt/bantablemodel.cpp
index 00a915dd8..4b34e73eb 100644
--- a/src/qt/bantablemodel.cpp
+++ b/src/qt/bantablemodel.cpp
@@ -64,7 +64,7 @@ public:
         }
 
         if (sortColumn >= 0)
-            // sort cachedBanlist (use stable sort to prevent rows jumping around unneceesarily)
+            // sort cachedBanlist (use stable sort to prevent rows jumping around unnecessarily)
             qStableSort(cachedBanlist.begin(), cachedBanlist.end(), BannedNodeLessThan(sortColumn, sortOrder));
     }
 
diff --git a/src/qt/paymentserver.h b/src/qt/paymentserver.h
index 37ee522d5..9d46280a3 100644
--- a/src/qt/paymentserver.h
+++ b/src/qt/paymentserver.h
@@ -21,10 +21,10 @@
 //
 // When startup is finished and the main window is
 // shown, a signal is sent to slot uiReady(), which
-// emits a receivedURL() signal for any payment
+// emits a receivedURI() signal for any payment
 // requests that happened during startup.
 //
-// After startup, receivedURL() happens as usual.
+// After startup, receivedURI() happens as usual.
 //
 // This class has one more feature: a static
 // method that finds URIs passed in the command line
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index 1e2842df7..1c0ed663c 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -608,7 +608,7 @@ void SendCoinsDialog::updateGlobalFeeVariables()
         // set nMinimumTotalFee to 0 to not accidentally pay a custom fee
         CoinControlDialog::coinControl->nMinimumTotalFee = 0;
 
-        // show the estimated reuquired time for confirmation
+        // show the estimated required time for confirmation
         ui->confirmationTargetLabel->setText(GUIUtil::formatDurationStr(nConfirmTarget * Params().GetConsensus().nPowTargetSpacing) + " / " + tr("%n block(s)", "", nConfirmTarget));
     }
     else
diff --git a/src/qt/utilitydialog.cpp b/src/qt/utilitydialog.cpp
index 70efe2799..7ab412528 100644
--- a/src/qt/utilitydialog.cpp
+++ b/src/qt/utilitydialog.cpp
@@ -39,7 +39,7 @@ HelpMessageDialog::HelpMessageDialog(QWidget *parent, bool about) :
 
     QString version = tr(PACKAGE_NAME) + " " + tr("version") + " " + QString::fromStdString(FormatFullVersion());
     /* On x86 add a bit specifier to the version so that users can distinguish between
-     * 32 and 64 bit builds. On other architectures, 32/64 bit may be more ambigious.
+     * 32 and 64 bit builds. On other architectures, 32/64 bit may be more ambiguous.
      */
 #if defined(__x86_64__)
     version += " " + tr("(%1-bit)").arg(64);
diff --git a/src/rpc/net.cpp b/src/rpc/net.cpp
index 27b9963a1..35747552f 100644
--- a/src/rpc/net.cpp
+++ b/src/rpc/net.cpp
@@ -150,7 +150,7 @@ UniValue getpeerinfo(const JSONRPCRequest& request)
             obj.push_back(Pair("pingwait", stats.dPingWait));
         obj.push_back(Pair("version", stats.nVersion));
         // Use the sanitized form of subver here, to avoid tricksy remote peers from
-        // corrupting or modifiying the JSON output by putting special characters in
+        // corrupting or modifying the JSON output by putting special characters in
         // their ver message.
         obj.push_back(Pair("subver", stats.cleanSubVer));
         obj.push_back(Pair("inbound", stats.fInbound));
diff --git a/src/script/script.cpp b/src/script/script.cpp
index 828ce1a05..9f4741b1c 100644
--- a/src/script/script.cpp
+++ b/src/script/script.cpp
@@ -129,7 +129,7 @@ const char* GetOpName(opcodetype opcode)
     case OP_CHECKMULTISIG          : return "OP_CHECKMULTISIG";
     case OP_CHECKMULTISIGVERIFY    : return "OP_CHECKMULTISIGVERIFY";
 
-    // expanson
+    // expansion
     case OP_NOP1                   : return "OP_NOP1";
     case OP_CHECKLOCKTIMEVERIFY    : return "OP_CHECKLOCKTIMEVERIFY";
     case OP_CHECKSEQUENCEVERIFY    : return "OP_CHECKSEQUENCEVERIFY";
diff --git a/src/test/serialize_tests.cpp b/src/test/serialize_tests.cpp
index 2d54668ea..9661a6651 100644
--- a/src/test/serialize_tests.cpp
+++ b/src/test/serialize_tests.cpp
@@ -90,7 +90,7 @@ BOOST_AUTO_TEST_CASE(sizes)
 
 BOOST_AUTO_TEST_CASE(floats_conversion)
 {
-    // Choose values that map unambigiously to binary floating point to avoid
+    // Choose values that map unambiguously to binary floating point to avoid
     // rounding issues at the compiler side.
     BOOST_CHECK_EQUAL(ser_uint32_to_float(0x00000000), 0.0F);
     BOOST_CHECK_EQUAL(ser_uint32_to_float(0x3f000000), 0.5F);
@@ -109,7 +109,7 @@ BOOST_AUTO_TEST_CASE(floats_conversion)
 
 BOOST_AUTO_TEST_CASE(doubles_conversion)
 {
-    // Choose values that map unambigiously to binary floating point to avoid
+    // Choose values that map unambiguously to binary floating point to avoid
     // rounding issues at the compiler side.
     BOOST_CHECK_EQUAL(ser_uint64_to_double(0x0000000000000000ULL), 0.0);
     BOOST_CHECK_EQUAL(ser_uint64_to_double(0x3fe0000000000000ULL), 0.5);
diff --git a/src/torcontrol.cpp b/src/torcontrol.cpp
index 5571b7de4..c49c5d9eb 100644
--- a/src/torcontrol.cpp
+++ b/src/torcontrol.cpp
@@ -372,7 +372,7 @@ private:
     struct event *reconnect_ev;
     float reconnect_timeout;
     CService service;
-    /** Cooie for SAFECOOKIE auth */
+    /** Cookie for SAFECOOKIE auth */
     std::vector<uint8_t> cookie;
     /** ClientNonce for SAFECOOKIE auth */
     std::vector<uint8_t> clientNonce;
diff --git a/src/txmempool.h b/src/txmempool.h
index f842a07dd..db1a02455 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -355,7 +355,7 @@ enum class MemPoolRemovalReason {
  * Transactions are added when they are seen on the network (or created by the
  * local node), but not all transactions seen are added to the pool. For
  * example, the following new transactions will not be added to the mempool:
- * - a transaction which doesn't make the mimimum fee requirements.
+ * - a transaction which doesn't meet the minimum fee requirements.
  * - a new transaction that double-spends an input of a transaction already in
  * the pool where the new transaction does not meet the Replace-By-Fee
  * requirements as defined in BIP 125.
diff --git a/src/utiltime.cpp b/src/utiltime.cpp
index 87a25866e..c7b3e4f16 100644
--- a/src/utiltime.cpp
+++ b/src/utiltime.cpp
@@ -63,7 +63,7 @@ void MilliSleep(int64_t n)
 {
 
 /**
- * Boost's sleep_for was uninterruptable when backed by nanosleep from 1.50
+ * Boost's sleep_for was uninterruptible when backed by nanosleep from 1.50
  * until fixed in 1.52. Use the deprecated sleep method for the broken case.
  * See: https://svn.boost.org/trac/boost/ticket/7238
  */
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index b4715622c..517202a9b 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -2576,7 +2576,7 @@ bool CWallet::CreateTransaction(const vector<CRecipient>& vecSend, CWalletTx& wt
                 // BIP125 defines opt-in RBF as any nSequence < maxint-1, so
                 // we use the highest possible value in that range (maxint-2)
                 // to avoid conflicting with other possible uses of nSequence,
-                // and in the spirit of "smallest posible change from prior
+                // and in the spirit of "smallest possible change from prior
                 // behavior."
                 for (const auto& coin : setCoins)
                     txNew.vin.push_back(CTxIn(coin.first->GetHash(),coin.second,CScript(),