diff --git a/README.md b/README.md
index 804dea9..bcda4d8 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,8 @@ It is not production-ready. Use at your own risk.
 
 - Hashmaps - Thread-safe (MT Safe)
 - Dynamic strings - Thread-safe (MT Safe)
-- Circular Queue - Thread-safe (MT Safe)
+- Circular Queues - Thread-safe (MT Safe)
+- Vectors - Thread-safe (MT Safe)
 
 ## Examples
 You can find examples inside `test/` folder.
diff --git a/meson.build b/meson.build
index 2d90872..21e65be 100644
--- a/meson.build
+++ b/meson.build
@@ -9,6 +9,7 @@ src = files(
   'hashmap/myhashmap.c',
   'queue/myqueue.c',
   'string/mystring.c',
+  'vector/myvector.c',
 )
 
 testlib = files(
@@ -17,10 +18,11 @@ testlib = files(
   'test/queue/q1.c',
   'test/string/str1.c',
   'test/string/str2.c',
+  'test/vector/v1.c',
 )
 
 sources = src + testlib
 
-inc_dir = include_directories('string', 'queue', 'hashmap')
+inc_dir = include_directories('string', 'queue', 'hashmap', 'vector')
 
 executable('testlib', sources, include_directories: inc_dir)
diff --git a/string/mystring.c b/string/mystring.c
index da2096f..4a89832 100644
--- a/string/mystring.c
+++ b/string/mystring.c
@@ -142,12 +142,24 @@ int mcl_string_extend(mcl_string_s *destination, mcl_string_s *source) {
 		return -1;
 	}
 
+	if (mtx_lock(&destination->lock) != thrd_success) {
+		return -1;
+	}
+
+	if (mtx_lock(&source->lock) != thrd_success) {
+		mtx_unlock(&destination->lock);
+		return -1;
+	}
+
 	size_t need = destination->size + source->size;
 	if (need > destination->capacity) {
 		/* Reallocate destination data buffer */
 		destination->capacity = next_power_two(need);
 		char *tmp = realloc(destination->data, destination->capacity);
 		if (tmp == NULL) {
+			mtx_unlock(&destination->lock);
+			mtx_unlock(&source->lock);
+
 			return -1;
 		}
 		destination->data = tmp;
@@ -158,6 +170,9 @@ int mcl_string_extend(mcl_string_s *destination, mcl_string_s *source) {
 	destination->size = need;
 	destination->data[destination->size] = '\0';
 
+	mtx_unlock(&destination->lock);
+	mtx_unlock(&source->lock);
+
 	return 0;
 }
 
diff --git a/test/test.c b/test/test.c
index 5c1bf8d..f2396f7 100644
--- a/test/test.c
+++ b/test/test.c
@@ -9,6 +9,7 @@ void test_hm1();
 void test_q1();
 void test_str1();
 void test_str2();
+void test_v1();
 
 int main(void) {
 	puts("==== [Running Hashmap tests] ====");
@@ -27,5 +28,10 @@ int main(void) {
 	puts("OK!");
 	puts("");
 
+	puts("==== [Running Vector tests] ====");
+	test_v1();
+	puts("OK!");
+	puts("");
+
 	return 0;
 }
diff --git a/test/vector/v1.c b/test/vector/v1.c
new file mode 100644
index 0000000..109c40e
--- /dev/null
+++ b/test/vector/v1.c
@@ -0,0 +1,34 @@
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "../../vector/myvector.h"
+
+typedef struct my_elem {
+	char name[32];
+	int age;
+} my_elem_s;
+
+void test_v1() {
+	/* Allocate a new vector */
+	size_t elem_size = sizeof(my_elem_s);
+	mcl_vector_s *v = mcl_vector_new(10, elem_size);
+	assert(mcl_vector_size(v) == 0);
+	assert(mcl_vector_capacity(v) == 16);
+
+	/* Push an element */
+	my_elem_s e1 = {
+		.age = 21,
+		.name = "John",
+	};
+	mcl_vector_push(v, &e1);
+	assert(mcl_vector_size(v) == 1);
+
+	/* Retrieve an element (Remember to FREE) */
+	my_elem_s *e1_v = (my_elem_s *)mcl_vector_get(v, 0);
+	printf("name: %s, age: %d\n", e1_v->name, e1_v->age);
+	free(e1_v);
+
+	/* Deallocate the vector */
+	mcl_vector_free(v);
+}
\ No newline at end of file
diff --git a/vector/myvector.c b/vector/myvector.c
new file mode 100644
index 0000000..77657d8
--- /dev/null
+++ b/vector/myvector.c
@@ -0,0 +1,146 @@
+#include "myvector.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <threads.h>
+
+/* Returns the next power of two of a number */
+static size_t next_power_two(size_t len) {
+	if (len == 0) return 1;
+
+	size_t p = 1;
+	while (p < len) {
+		if (p > SIZE_MAX / 2) {
+			p = len;
+			break;
+		}
+		p <<= 1;
+	}
+
+	return p;
+}
+
+mcl_vector_s *mcl_vector_new(size_t initial_capacity, size_t element_size) {
+	if (initial_capacity < 0) {
+		return NULL;
+	}
+
+	mcl_vector_s *vec = (mcl_vector_s *)malloc(sizeof(mcl_vector_s));
+	if (vec == NULL) {
+		return NULL;
+	}
+
+	vec->capacity = next_power_two(initial_capacity);
+	vec->elem_size = element_size;
+	vec->size = 0;
+	vec->data = malloc(vec->capacity * vec->elem_size);
+	if (vec->data == NULL) {
+		free(vec);
+
+		return NULL;
+	}
+
+	if (mtx_init(&vec->lock, mtx_plain) != thrd_success) {
+		free(vec->data);
+		free(vec);
+
+		return NULL;
+	}
+
+	return vec;
+}
+
+int mcl_vector_push(mcl_vector_s *vec, void *elem) {
+	if (vec == NULL || elem == NULL) {
+		return -1;
+	}
+
+	if (mtx_lock(&vec->lock) != thrd_success) {
+		return -1;
+	}
+
+	if (vec->size + 1 > vec->capacity) {
+		/* Reallocate buffer */
+		vec->capacity = next_power_two(vec->size + 1);
+		void *tmp = malloc(vec->capacity * vec->elem_size);
+		if (tmp == NULL) {
+			mtx_unlock(&vec->lock);
+
+			return -1;
+		}
+		vec->data = tmp;
+	}
+
+	/* Add the new element */
+	memcpy(vec->data + (vec->size * vec->elem_size), elem, vec->elem_size);
+	vec->size++;
+
+	mtx_unlock(&vec->lock);
+
+	return 0;
+}
+
+void mcl_vector_free(mcl_vector_s *vec) {
+	if (vec == NULL) {
+		return;
+	}
+
+	if (vec->data != NULL) {
+		free(vec->data);
+	}
+
+	free(vec);
+}
+
+size_t mcl_vector_size(mcl_vector_s *vec) {
+	if (vec == NULL) {
+		return -1;
+	}
+
+	if (mtx_lock(&vec->lock) != thrd_success) {
+		return -1;
+	}
+
+	size_t size = vec->size;
+
+	mtx_unlock(&vec->lock);
+
+	return size;
+}
+
+size_t mcl_vector_capacity(mcl_vector_s *vec) {
+	if (vec == NULL) {
+		return -1;
+	}
+
+	if (mtx_lock(&vec->lock) != thrd_success) {
+		return -1;
+	}
+
+	size_t cap = vec->capacity;
+
+	mtx_unlock(&vec->lock);
+
+	return cap;
+}
+
+void *mcl_vector_get(mcl_vector_s *vec, size_t index) {
+	if (vec == NULL || index < 0 || index > vec->size) {
+		return NULL;
+	}
+
+	if (mtx_lock(&vec->lock) != thrd_success) {
+		return NULL;
+	}
+
+	void *elem = malloc(vec->elem_size);
+	if (elem == NULL) {
+		return NULL;
+	}
+
+	memcpy(elem, vec->data + (index * vec->elem_size), vec->elem_size);
+
+	mtx_unlock(&vec->lock);
+
+	return elem;
+}
diff --git a/vector/myvector.h b/vector/myvector.h
new file mode 100644
index 0000000..4412d24
--- /dev/null
+++ b/vector/myvector.h
@@ -0,0 +1,25 @@
+#ifndef MYCLIB_VECTOR_H
+#define MYCLIB_VECTOR_H
+
+#include <stddef.h>
+#include <stdint.h>
+#include <threads.h>
+
+typedef struct {
+	void *data;
+	size_t elem_size;
+	size_t size;
+	size_t capacity;
+	mtx_t lock;
+} mcl_vector_s;
+
+mcl_vector_s *mcl_vector_new(size_t initial_capacity, size_t element_size);
+int mcl_vector_push(mcl_vector_s *vec, void *elem);
+size_t mcl_vector_size(mcl_vector_s *vec);
+size_t mcl_vector_capacity(mcl_vector_s *vec);
+
+void *mcl_vector_get(mcl_vector_s *vec, size_t index);
+
+void mcl_vector_free(mcl_vector_s *vec);
+
+#endif