Trucco (also called trucks, troco, or lawn billiards) is an Italian and later English lawn game, a form of ground billiards played with heavy balls, large-headed cues sometimes called tacks, a ring (also called the argolis or port), and sometimes an upright pin (the sprigg or king). The game was popular from at least the 17th century to the early 20th century, and was a forerunner of croquet, surviving for a few generations after the introduction of the latter.

The oldest name in English seems to be trucks or truck from the Italian trucco and Spanish troco, meaning 'billiard'. The game appears to be derived from jeu de mail and its offshoot pall-mall (the latter having been especially popular in England in the 16th and 17th centuries, as well as in western continental Europe); both were earlier ground billiards games, using mallets and often featuring a hoop target (then usually made of straw).

Trucco was popular as a country-house pastime in the 19th century. Under the name lawn billiards, it appears as an alternative to croquet in English books of games and pastimes of the period, and was also attested in the United States in this period. Trucco was also played at pubs with large lawns, but apparently died out by the time of World War II. The 1884 edition of Enquire Within upon Everything, a concise household-life handbook and topical encyclopedia, suggested that the game was popular enough in England in the late Victorian era that "the balls, cues, &c., are sold by most dealers in croquet implements".

An English painting of the early 17th century illustrates two fancily-dressed gentlemen playing trucco in small rectangular court without turf (probably clay, and perhaps 10–12 feet (3.0–3.7 m) wide and of larger but indeterminate length) bounded with wooden boards, using scoop-shaped maces, a ring-shaped target mounted upright on the ground, and a single leather or wooden ball barely small enough to fit through the hoop, and well under 1 foot (0.30 m) in diameter, if the scale in the image can be trusted. By the 19th century, the game in the same country was played in a round and usually unbounded area, often a lawn, and there was a ball for each player.

The late-19th-century version of trucco was described in many editions of Enquire Within (spellings are as in the original):

This is a game that may be played by any number of persons in a field or open space. The implements are wooden balls and long-handled cues at the ends of which are spoonlike ovals of iron. In the centre of the Troco ground is fixed a ring of iron, which moves freely on a pivot .... The wooden ball is lifted from the ground by means of the spoon-ended cue, and thrown towards the ring – the object of the player being to pass the ball through the ring; and he who succeeds in making any given number of points by fairly ringing his ball, or canoning against the other balls, wins the game.

Canons are made by the player striking ... balls successively with his own ball fairly delivered from his spoon. Thus ... a clever player may make a large number of points – five, seven, or more at a stroke: two the first canon, two for a second canon, and three for the ring. This, however, is very seldom accomplished.

Considerable skill is required in throwing the ball, as the ring, turning freely on its pivot, twists round on being struck. To "make the ring," it is necessary, therefore, that the ball be thrown fairly through its centre. But in order to get nearer to it a judicious player will endeavour to make two or three canons, if the balls lie within a convenient distance and at a proper angle to each other.