Non-Orthodox at Orthodox Services
In brief
Visitors are welcome at Orthodox services — all of them, from start to finish, with no obligation to do anything but be present. One thing is reserved: Holy Communion, which only Orthodox Christians who have prepared for it receive. This "closed communion" is not a snub and not a judgment on anyone's sincerity; it is the Church's ancient conviction that Communion is the seal of a faith already shared, not the door into it. Nearly everything else is open to you.
You are genuinely welcome
Orthodox churches expect visitors. Inquirers, friends and family at weddings and baptisms, the curious who wandered in for the singing — all of them belong in the congregation, and no one will quiz you at the door. You may come for a whole service or part of one; you may stand with everyone, or sit when you need to; you may sing along where you can. In the early centuries, those not yet baptized were dismissed halfway through the Divine Liturgy — a dismissal still audible in the service's words — but today visitors simply stay for everything.
No one expects you to know the customs. Arrive when you can, follow the congregation's lead, and let the service wash over you. A first-visit guide covers the practicalities — the standing, the incense, the absence of pews in some churches, the children everywhere.
Why Communion is closed
When the Chalice is brought out, only Orthodox Christians — and only those who have prepared by prayer, fasting, and regular confession — come forward. This is not a snub, and it is emphatically not a verdict on the sincerity or holiness of anyone else's faith. In Orthodox understanding, Communion is the deepest possible statement of unity: one faith, one baptism, one visible Church gathered at one Chalice. To receive together is to say that all of that is already shared. Where it is not yet shared, the Church believes the honest thing is not to say it — the same reason the Church asks its own faithful not to receive communion elsewhere. The rule cuts both ways, because it is about what Communion is, not about who is worthy.
This is not a modern defensiveness but the practice of the earliest Church. Writing around the year 155, St. Justin Martyr described the Eucharist to a pagan audience in exactly these terms — open only to the baptized who share the Church's faith and life. St. Paul, likewise, warns the Corinthians that the Lord's Supper is received with self-examination or not at all (1 Corinthians 11:28-29). The closed Chalice is the Church taking both the gift and the guest seriously; many visitors, once it is explained, find it more honest than a hospitality that pretends the divisions of Christendom away.
What you may do — and where to go from here
Nearly everything else is open to you. You may light a candle and pray for anyone you love; you may venerate the icons if you are comfortable doing so, or simply look at them if you are not; you may join the singing and the responses, receive the priest's greeting, and stay for coffee hour, where the real interrogation — friendly, and mostly about where you're from — takes place. At the end of the Liturgy, blessed bread called antidoron is distributed; it is not Communion, and in most parishes visitors are welcome to receive it — if you are unsure of local practice, just ask, and no one will be offended.
If the visit turns into something more, the path is unhurried. Talk to the priest — that is what he is for — or simply keep coming; Orthodoxy is far more often absorbed than argued into. The Church has old and patient categories for exactly your situation: the inquirer, who is asking questions, and the catechumen, who is preparing to enter. What that whole journey looks like is told in How to Become an Orthodox Christian. Until then — and however long "until then" lasts — you are welcome exactly as you are.