diff --git a/hblang/README.md b/hblang/README.md
index ade4f69..f2ed519 100644
--- a/hblang/README.md
+++ b/hblang/README.md
@@ -543,3 +543,18 @@ sqrt := fn(x: int): int {
 	return g
 }
 ```
+
+#### hex_octal_binary_literals
+```hb
+main := fn(): int {
+	hex := 0xFF
+	decimal := 255
+	octal := 0o377
+	binary := 0b11111111
+
+	if hex == decimal & octal == decimal & binary == decimal {
+		return 0
+	}
+	return 1
+}
+```
\ No newline at end of file
diff --git a/hblang/src/codegen.rs b/hblang/src/codegen.rs
index ed556b9..acf9b5c 100644
--- a/hblang/src/codegen.rs
+++ b/hblang/src/codegen.rs
@@ -3340,5 +3340,6 @@ mod tests {
         struct_return_from_module_function => README;
         comptime_pointers => README;
         sort_something_viredly => README;
+        hex_octal_binary_literals => README;
     }
 }
diff --git a/hblang/src/lexer.rs b/hblang/src/lexer.rs
index b103860..9b4a1ae 100644
--- a/hblang/src/lexer.rs
+++ b/hblang/src/lexer.rs
@@ -292,6 +292,24 @@ impl<'a> Lexer<'a> {
 
             let kind = match c {
                 ..=b' ' => continue,
+                b'0' if self.advance_if(b'x') => {
+                    while let Some(b'0'..=b'9' | b'A'..=b'F' | b'a'..=b'f') = self.peek() {
+                        self.advance();
+                    }
+                    T::Number
+                }
+                b'0' if self.advance_if(b'b') => {
+                    while let Some(b'0' | b'1') = self.peek() {
+                        self.advance();
+                    }
+                    T::Number
+                }
+                b'0' if self.advance_if(b'o') => {
+                    while let Some(b'0'..=b'7') = self.peek() {
+                        self.advance();
+                    }
+                    T::Number
+                }
                 b'0'..=b'9' => {
                     while let Some(b'0'..=b'9') = self.peek() {
                         self.advance();
diff --git a/hblang/src/parser.rs b/hblang/src/parser.rs
index 59fe5f8..541e66f 100644
--- a/hblang/src/parser.rs
+++ b/hblang/src/parser.rs
@@ -389,13 +389,23 @@ impl<'a, 'b> Parser<'a, 'b> {
                 pos: token.start,
                 stmts: self.collect_list(T::Semi, T::RBrace, Self::expr),
             },
-            T::Number => E::Number {
-                pos: token.start,
-                value: match self.lexer.slice(token.range()).parse() {
-                    Ok(value) => value,
-                    Err(e) => self.report(format_args!("invalid number: {e}")),
-                },
-            },
+            T::Number => {
+                let slice = self.lexer.slice(token.range());
+                let (slice, radix) = match &slice.get(0..2) {
+                    Some("0x") => (slice.trim_start_matches("0x"), Radix::Hex),
+                    Some("0b") => (slice.trim_start_matches("0b"), Radix::Binary),
+                    Some("0o") => (slice.trim_start_matches("0o"), Radix::Octal),
+                    _ => (slice, Radix::Decimal),
+                };
+                E::Number {
+                    pos: token.start,
+                    value: match u64::from_str_radix(slice, radix as u32) {
+                        Ok(value) => value,
+                        Err(e) => self.report(format_args!("invalid number: {e}")),
+                    },
+                    radix,
+                }
+            }
             T::LParen => {
                 let expr = self.expr();
                 self.expect_advance(T::RParen);
@@ -620,6 +630,15 @@ macro_rules! generate_expr {
     (@last ($($last:tt)*),) => { $($last)* };
 }
 
+#[repr(u32)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub enum Radix {
+    Hex = 16,
+    Octal = 8,
+    Binary = 2,
+    Decimal = 10,
+}
+
 // it would be real nice if we could use relative pointers and still pattern match easily
 generate_expr! {
     #[derive(Debug, Clone, Copy, PartialEq, Eq)]
@@ -671,6 +690,7 @@ generate_expr! {
         Number {
             pos:   Pos,
             value: u64,
+            radix: Radix,
         },
         BinOp {
             left:  &'a Self,
@@ -992,7 +1012,12 @@ impl<'a> std::fmt::Display for Expr<'a> {
                 write!(f, "}}")?;
                 res
             }
-            Self::Number { value, .. } => write!(f, "{value}"),
+            Self::Number { value, radix, .. } => match radix {
+                Radix::Decimal => write!(f, "{value}"),
+                Radix::Hex => write!(f, "{value:#X}"),
+                Radix::Octal => write!(f, "{value:#o}"),
+                Radix::Binary => write!(f, "{value:#b}"),
+            },
             Self::Bool { value, .. } => write!(f, "{value}"),
             Self::BinOp {
                 left,
diff --git a/hblang/tests/codegen_tests_hex_octal_binary_literals.txt b/hblang/tests/codegen_tests_hex_octal_binary_literals.txt
new file mode 100644
index 0000000..e3aee3a
--- /dev/null
+++ b/hblang/tests/codegen_tests_hex_octal_binary_literals.txt
@@ -0,0 +1,3 @@
+code size: 210
+ret: 0
+status: Ok(())