Here is an example of a basic login form using ReactJS:

```js
import React, { useState } from 'react';

function LoginForm() {
  const [username, setUsername] = useState('');
  const [password, setPassword] = useState('');

  const handleSubmit = (event) => {
    event.preventDefault();
    console.log('Username:', username);
    console.log('Password:', password);
  };

  return (
    <form onSubmit={handleSubmit}>
      <label>
        Username:
        <input type="text" value={username} onChange={(event) => setUsername(event.target.value)} />
      </label>
      <br />
      <label>
        Password:
        <input type="password" value={password} onChange={(event) => setPassword(event.target.value)} />
      </label>
      <br />
      <button type="submit">Log In</button>
    </form>
  );
}

export default LoginForm;
```
In this example, we use the `useState` hook to create state variables for the username and password inputs. We also define a `handleSubmit` function to handle the form submission, which logs the username and password to the console.

The return statement contains the actual form, with two input elements for the username and password, and a button element to submit the form. The `onChange` events for each input element update the state variables for the username and password as the user types. Finally, we export the `LoginForm` component for use in other parts of our React app.
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