I is a tabletop role-playing game supplement, written by Jordan Weisman, with a cover by William H. Keith, for Traveller, and published by FASA in 1981.

I is a set consisting of sheets of 15mm scale deck plans and booklets of statistics and descriptions for ten distinct Imperial, Zhodani and independent ships, plus plans of a smaller scale for four additional auxiliary ships.

I was written by Jordan Weisman, Craig Johnson, Scott Walschlager, and Ross Babcock, and was published in 1981 by FASA as a boxed set containing a 16-page pamphlet, and five large double-sided map sheets.

William A. Barton reviewed Adventure Class Ships, Vol.

I proves an excellent play aid for Traveller and is recommended fully.