func (s *TeamsService) ListTeams(ctx context.Context, org string, opt *ListOptions) ([]*Team, *Response, error) {
	u := fmt.Sprintf("orgs/%v/teams", org)
	u, err := addOptions(u, opt)
	if err != nil {
		return nil, nil, err
	}
	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}
	req.Header.Set("Accept", mediaTypeNestedTeamsPreview)
	var teams []*Team
	resp, err := s.client.Do(ctx, req, &teams)
	if err != nil {
		return nil, resp, err
	}
	return teams, resp, nil
}
ListTeams lists all of the teams for an organization.

GitHub API docs: https://developer.github.com/v3/teams/#list-teams
package github
import (
	"context"
	"fmt"
	"strings"
	"time"
)
type TeamsService service
type Team struct {
	ID          *int64  `json:"id,omitempty"`
	Name        *string `json:"name,omitempty"`
	Description *string `json:"description,omitempty"`
	URL         *string `json:"url,omitempty"`
	Slug        *string `json:"slug,omitempty"`
	Permission *string `json:"permission,omitempty"`
	Privacy *string `json:"privacy,omitempty"`
	MembersCount    *int          `json:"members_count,omitempty"`
	ReposCount      *int          `json:"repos_count,omitempty"`
	Organization    *Organization `json:"organization,omitempty"`
	MembersURL      *string       `json:"members_url,omitempty"`
	RepositoriesURL *string       `json:"repositories_url,omitempty"`
	Parent          *Team         `json:"parent,omitempty"`
	LDAPDN *string `json:"ldap_dn,omitempty"`
}
func (t Team) String() string {
	return Stringify(t)
}
type Invitation struct {
	ID    *int64  `json:"id,omitempty"`
	Login *string `json:"login,omitempty"`
	Email *string `json:"email,omitempty"`
	Role              *string    `json:"role,omitempty"`
	CreatedAt         *time.Time `json:"created_at,omitempty"`
	Inviter           *User      `json:"inviter,omitempty"`
	TeamCount         *int       `json:"team_count,omitempty"`
	InvitationTeamURL *string    `json:"invitation_team_url,omitempty"`
}
func (i Invitation) String() string {
	return Stringify(i)
}