You can build your own decorator that encapsulates the common options:

def common_options(function):
    function = click.option('--unique-flag-1', is_flag=True)(function)
    function = click.option('--bar', is_flag=True)(function)
    function = click.option('--foo', is_flag=True)(function)
    return function

@click.command()
@common_options
def command():
    pass

The way you currently defined it it will work, but the --verbose option belongs to the main command group, so you'd need to call it as python script.py --verbose list (and my_find_command and my_list_command won't receive it as an argument, only cli).

To use the same option across multiple commands without repeating yourself too much, you can just assign it to a variable and then use it twice:

verbose_option = click.option(
    "-v",
    "--verbose",
    count=True,
    default=0,
    help="-v for DEBUG",
)

...

@click.command()
@verbose_option
def foo(verbose):
    ...

@click.command()
@verbose_option
def bar(verbose):
    ...

Unrelated, but while we're at it: There's a simpler way of grouping commands, without having to do cli.add_command(my_find_command): Just use @cli.command() instead of @click.command():

import click

option_verbose = click.option(
    "-v",
    "--verbose",
    count=True,
    default=0,
    help="-v for DEBUG",
)

@click.group()
def cli():
    pass


@cli.command("list")
@option_verbose
@click.option(
    "--list-option",
    help="Special option for list command.",
)
def my_list_command(verbose, list_option):
    print(verbose, list_option)

@cli.command("find")
@option_verbose
@click.option(
    "--find-option",
    help="Special option for find command.",
)
def my_find_command(verbose, list_option):
    print(verbose, list_option)

if __name__ == '__main__':
    cli()

If there's several options you want to apply, you can define your own decorator that calls all those options on the argument:

def common_options(fn):
    return click.option(
        "-v",
        "--verbose",
    )(
        click.option(
            "-n",
            "--dry-run",
        )(fn)
    )

I have found a simple solution! I slightly edited the snippet from https://github.com/pallets/click/issues/108 :

import click


_cmd1_options = [
    click.option('--cmd1-opt')
]

_cmd2_options = [
    click.option('--cmd2-opt')
]


def add_options(options):
    def _add_options(func):
        for option in reversed(options):
            func = option(func)
        return func
    return _add_options


@click.group()
def group(**kwargs):
    pass


@group.command()
@add_options(_cmd1_options)
def cmd1(**kwargs):
    print(kwargs)


@group.command()
@add_options(_cmd2_options)
def cmd2(**kwargs):
    print(kwargs)


@group.command()
@add_options(_cmd1_options)
@add_options(_cmd2_options)
@click.option("--cmd3-opt")
def cmd3(**kwargs):
    print(kwargs)


if __name__ == '__main__':
    group()