diff --git a/src/base58.cpp b/src/base58.cpp
--- a/src/base58.cpp
+++ b/src/base58.cpp
@@ -142,7 +142,7 @@
         vchRet.clear();
         return false;
     }
-    // re-calculate the checksum, insure it matches the included 4-byte checksum
+    // re-calculate the checksum, ensure it matches the included 4-byte checksum
     uint256 hash = Hash(vchRet.begin(), vchRet.end() - 4);
     if (memcmp(&hash, &vchRet.end()[-4], 4) != 0) {
         vchRet.clear();
diff --git a/src/blockencodings.cpp b/src/blockencodings.cpp
--- a/src/blockencodings.cpp
+++ b/src/blockencodings.cpp
@@ -176,7 +176,7 @@
                 // If we find two mempool/extra txn that match the short id,
                 // just request it. This should be rare enough that the extra
                 // bandwidth doesn't matter, but eating a round-trip due to
-                // FillBlock failure would be annoying. Note that we dont want
+                // FillBlock failure would be annoying. Note that we don't want
                 // duplication between extra_txns and mempool to trigger this
                 // case, so we compare hashes first.
                 if (txns_available[idit->second] &&
diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -459,7 +459,7 @@
                 QFont::insertSubstitution(".Helvetica Neue DeskInterface",
                                           "Heiti SC");
             } else if (language == "ja") {
-                // Japanesee
+                // Japanese
                 QFont::insertSubstitution(".Helvetica Neue DeskInterface",
                                           "Songti SC");
             } else {
diff --git a/src/qt/test/paymentservertests.cpp b/src/qt/test/paymentservertests.cpp
--- a/src/qt/test/paymentservertests.cpp
+++ b/src/qt/test/paymentservertests.cpp
@@ -145,7 +145,7 @@
     byteArray = QByteArray((const char *)&data[0], data.size());
     r.paymentRequest.parse(byteArray);
     // Ensure the request is initialized, because network "main" is default,
-    // even for uninizialized payment requests and that will fail our test here.
+    // even for uninitialized payment requests and that will fail our test here.
     QVERIFY(r.paymentRequest.IsInitialized());
     QCOMPARE(PaymentServer::verifyNetwork(*node, r.paymentRequest.getDetails()),
              false);
diff --git a/src/test/cuckoocache_tests.cpp b/src/test/cuckoocache_tests.cpp
--- a/src/test/cuckoocache_tests.cpp
+++ b/src/test/cuckoocache_tests.cpp
@@ -384,7 +384,7 @@
         // Loose Check that hit rate is above min_hit_rate
         BOOST_CHECK(hit > min_hit_rate);
         // Tighter check, count number of times we are less than tight_hit_rate
-        // (and implicityly, greater than min_hit_rate)
+        // (and implicitly, greater than min_hit_rate)
         out_of_tight_tolerance += hit < tight_hit_rate;
     }
     // Check that being out of tolerance happens less than
diff --git a/src/test/merkle_tests.cpp b/src/test/merkle_tests.cpp
--- a/src/test/merkle_tests.cpp
+++ b/src/test/merkle_tests.cpp
@@ -270,7 +270,7 @@
             // branches.
             if (mutate == 0) {
                 for (int loop = 0; loop < std::min(ntx, 16); loop++) {
-                    // If ntx <= 16, try all branches. Otherise, try 16 random
+                    // If ntx <= 16, try all branches. Otherwise, try 16 random
                     // ones.
                     int mtx = loop;
                     if (ntx > 16) {
diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -813,7 +813,7 @@
     SeedInsecureRand(true);
     for (int mod = 2; mod < 11; mod++) {
         int mask = 1;
-        // Really rough binomal confidence approximation.
+        // Really rough binomial confidence approximation.
         int err =
             30 * 10000. / mod * sqrt((1. / mod * (1 - 1. / mod)) / 10000.);
         // mask is 2^ceil(log2(mod))-1
diff --git a/src/validation.cpp b/src/validation.cpp
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -4011,7 +4011,7 @@
 
     // TODO: Decouple this function from the block download logic by removing
     // fRequested
-    // This requires some new chain datastructure to efficiently look up if a
+    // This requires some new chain data structure to efficiently look up if a
     // block is in a chain leading to a candidate for best tip, despite not
     // being such a candidate itself.